在进行了100多次采访，搜查了嫌疑人的家和车辆，并破解了他的手机后，美国联邦调查局调查人员周二仍在寻找导致一名20岁宾夕法尼亚州男子的动机企图暗杀前总统。
随着导致前总统唐纳德·特朗普(Donald Trump)遇刺的安全失败的影响继续蔓延，宾夕法尼亚州警方周二下午表示，该州警方没有负责保护枪手从距离集会舞台约400英尺的屋顶开枪的区域，他击中了特朗普的右耳，打死了一名旁观者，打伤了另外两人。
该州警方在一份声明中表示，它向特勤局提供了“所有资源”,包括30至40名士兵，以协助确保宾夕法尼亚州巴特勒镇竞选集会场地的内部安全，但“不负责确保建筑物或财产的安全”,在安全周界之外，潜在的刺客开枪了。
在一个美国广播公司新闻的独家采访美国特勤局局长金伯利·谢特尔(Kimberly Cheatle)证实，在枪手在屋顶向特朗普开枪的同时，当地警察也在大楼内。Cheatle还说，当地政府的任务是确保该建筑的安全。
“在这种特殊情况下，我们确实分享了对那个特殊地点的支持，特勤局负责内部警戒。然后我们向当地的同行寻求外围的帮助。
联邦政府警告“报复性”行为
随着调查的继续，牵头调查的美国联邦调查局和国土安全部的官员周一晚间警告称，可能会出现“后续”或“报复”行为。
“我们不能排除一些DVE或其他行为者可能会试图采取后续或报复性暴力行动来回应这次暗杀企图，”这两个机构在一份联合公报中说，使用的是“国内暴力极端主义”的首字母缩写
被指控的袭击者使用的手机，托马斯·马修·克鲁克斯官员们周一表示，美国联邦调查局的技术人员在弗吉尼亚州匡提科获得了其内容。
调查人员没有立即表示，在美国联邦调查局实验室进行的手机分析是否提供了任何线索，说明是什么驱使嫌疑人对川普的生命做出如此厚颜无耻的尝试——这是调查的关键焦点。
但一名美国联邦调查局官员表示，调查人员预计将开始分析该设备的内容，因为他们专注于寻找导致一名拉力赛选手死亡、另外两人受伤的枪击事件的动机。
美国联邦调查局官员还表示，对嫌疑人在宾夕法尼亚州伯特利公园(Bethel Park)的车辆和住所的搜查已经完成，该公园位于周六巴特勒镇竞选活动发生地以南约53英里。根据美国联邦调查局和国土安全部的公告，在克鲁克斯的车里发现了两个简易爆炸装置，在他的家里发现了一个。
“在过去的几个月里，克鲁克斯收到了几个包裹，根据对他运输历史的审查，其中一些被标记为可能含有危险物质，”公告说。
公告显示，在枪击发生的当天，克鲁克斯在前往宾夕法尼亚州贝瑟尔公园的一家枪支商店参加集会之前，购买了50发子弹。不清楚公告指的是哪家商店。
嫌犯要求借爸爸的AR-15式步枪
据知情人士透露，ABC新闻了解到，在枪击事件发生的当天，克鲁克斯告诉他的父亲，他想去射击场，并问他是否可以借用他父亲的AR15式步枪。消息人士称，由于父亲偶尔会允许克鲁克斯用半自动枪支打靶，所以周六让他再次使用步枪时，他不认为有任何可疑之处。
调查人员表示，克鲁克斯在企图暗杀特朗普时使用了这支步枪。该消息人士还称，克鲁克斯最近在网上购买弹药，也亲自购买。
执法部门也一直在调查匹兹堡地区的当地枪支商店，寻找他们能收集到的关于骗子弹药购买习惯的任何信息，包括在店内购买和在线运输。这些商店包括阿勒格尼武器公司& Gun在贝瑟尔公园工作，离克鲁克斯的住处大约一英里。
“作为我们社区中负责任的一员，以各种方式与执法部门合作是我们的特权，”阿勒格尼·阿姆斯在给美国广播公司新闻的一份声明中说。“我们感谢特朗普总统没有被暗杀，我们的心和祈祷与这一可怕事件的所有受害者同在。出于对正在进行的调查和受影响者的尊重，我们不会发表任何进一步的声明。”
该局官员在一份声明中说，美国联邦调查局调查人员对执法人员、活动参与者和其他证人进行了近100次采访，努力弄清集会上发生的事情。
美国联邦调查局在声明中说:“美国联邦调查局已经收到了数百条数字媒体提示，其中包括在现场拍摄的照片和视频，我们将继续审查收到的提示。”。
动机不明
当局说，联邦对前总统未遂暗杀的调查集中在嫌疑枪手的犯罪动机以及他是否得到了其他人的帮助。
美国总统乔·拜登(Joe Biden)周日晚上在椭圆形办公室向全国发表讲话时表示，尚不清楚是什么促使被确认为骗子的嫌疑人试图在光天化日之下对特朗普的生命进行如此无耻的企图。
“我们不知道他的观点或从属关系。我们不知道他是否得到了帮助或支持，也不知道他是否和其他人联系过，”拜登说。"正如我所说，执法人员正在调查这些问题."
周六下午，特朗普在户外集会上发表演讲约10分钟后，枪声响起，随后是尖叫声。美国联邦调查局周日晚些时候在一份声明中说，这位前总统在特勤局特工包围他时，抓住他流血的右耳并扑倒在地。
据宾夕法尼亚州州长乔希·夏皮罗(Josh Shapiro)称，一名旁观者，50岁的科里·康伯雷托(Corey Comperatore)是当地的志愿消防员，在试图保护家人免受枪击时丧生，他称康伯雷托为“英雄”。事件中被枪击的另外两名拉力赛选手被宾夕法尼亚州警方确认为57岁的大卫·达奇，来自宾夕法尼亚州的新肯辛顿;宾夕法尼亚州月亮镇74岁的詹姆斯·科本哈沃。
官员们说，荷兰和哥本哈根被列为情况稳定。
“美国联邦调查局还没有确定枪手的行动动机，但我们正在努力确定事件的顺序和枪手在枪击前的行动，收集和审查证据，进行采访，并跟进所有线索，”该局在声明中说。
官员们说，嫌疑人开枪的那栋大楼位于安全周界之外，但距离特朗普发表讲话的讲台不到400英尺。
执法人员告诉ABC新闻，调查人员已经开始追溯嫌疑人的脚步，试图找出骗子是如何爬上屋顶的，屋顶在事件发生前已经被清扫过了。
就在枪击前一刻，人群中的目击者试图向特勤局特工指出这名武装嫌犯。巴特勒县治安官迈克尔·t·斯卢普告诉美国广播公司新闻，巴特勒镇的一名警察爬上屋顶，试图与将武器转向这名警察的枪手交火，迫使他后退，并补充说，他是从其他执法官员那里得知这次遭遇的。
在被这名官员打断后，嫌疑人开始向特朗普的方向开火，就在这位假定的共和党总统候选人转头看大屏幕时，特朗普后来声称这一举动可能救了他的命。
官员们说，枪手被安置在集会周围屋顶的四名特勤局反狙击手之一击毙。
美国联邦调查局正在领导对枪击事件的调查。
美国联邦调查局主任克里斯托弗·雷(Christopher Wray)称，对川普的暗杀企图“无异于对民主和我们民主进程的攻击”
国土安全部长称枪手应该从未有过清晰的射击
负责监管美国特勤局的美国国土安全部部长亚历杭德罗·马约卡斯(Alejandro Mayorkas)表示，星期一说在美国广播公司(ABC)的《早安美国》(Good Morning America)节目中，这名企图暗杀特朗普的20岁枪手应该永远无法清楚地看到这位前总统。
在乔治·斯特凡诺普洛斯主持的“早安美国”节目的采访中，马约卡斯说枪击事件本不应该发生。
“乔治，像这样直接瞄准美国前总统是不应该的，”马约卡斯说。
调查人员说，马约尔卡斯说，拜登周日宣布的一项独立调查已经在进行中，重点是涉嫌枪手的动机，这名枪手被确认为托马斯·马修·克鲁克斯(Thomas Matthew Crooks)，他设法爬上了一座农业建筑的屋顶，距离特朗普演讲的舞台约400英尺。
“我们必须了解袭击者的一切，当然，特勤局制服了他，”Mayorkas说。“我们将真正独立地研究这一事件，并向特勤局和我提出建议，以便我们能够确保我们受保护者的安全，这是我们特勤局最重要的任务之一。”
马约卡斯说，在国土安全部之外有一个“独立的机构”是很重要的，因为“调查过程的完整性、得出的结论和提出的建议得到了政府和美国公众的充分信任”。我们打算对独立审查的结果和建议保持透明。”
拜登承诺在针对特朗普的暗杀企图发生后进行独立调查。拜登说，独立调查的结果将会公之于众。
在采访中，马约尔卡斯拒绝了“错误”的说法，即特勤局拒绝了为特朗普的安全细节提供额外资源的请求。
“我们会密切关注不断变化的威胁环境。总统，前总统，通常一直受到威胁。“我们认真对待每一个威胁。我们根据需要进行安全调整。从6月份开始，我们加强了对前总统的安保。我们没有收到任何被拒绝的增加安全措施的要求。那是假的。”
拜登还下令特勤局审查定于周一在密尔沃基举行的共和党全国代表大会的安保计划。马约卡斯说，他对RNC的安全计划充满信心。
在嫌疑人的汽车和家中发现可疑装置
由匹兹堡办事处领导的美国联邦调查局调查人员搜查了克鲁克在匹兹堡郊区贝瑟尔公园的家。美国联邦调查局说，他们还搜查了他的车，这辆车在巴特勒的枪击现场。
美国联邦调查局说:“在这两个地方发现的可疑装置已经被炸弹技术人员处理安全，正在美国联邦调查局实验室进行评估。”。
执法部门消息人士告诉ABC新闻，据称克鲁克斯使用的AR-15型步枪是嫌疑人的父亲在2013年合法购买的。这家人正在配合调查。
特勤局局长强调要弄清事情的真相
在周一发布的一份声明中，美国特勤局局长金伯利·谢特尔(Kimberly Cheatle)强调，她的机构正专注于了解枪手如何清楚地射中特朗普。她还表达了对特勤局RNC安全计划的信心。
“特勤局正在与所有相关的联邦、州和地方机构合作，以了解发生了什么，它是如何发生的，以及我们如何才能防止类似事件再次发生，”奇特尔说。“我们理解拜登总统昨天宣布的独立评估的重要性，并将全面参与。”
自从暗杀企图以来，Cheatle说她一直与宾夕法尼亚州的特工人员保持联系。
美国联邦调查局已经接手调查。
“我也一直在与前总统特朗普的保护细节进行协调，并向拜登总统介绍了事件的细节，”谢特尔说。
谢特尔说，对川普的暗杀企图“可以理解地导致了对RNC安全系统潜在更新或改变的质疑”。她说，自枪击事件发生以来，该机构还对特朗普的安保细节进行了调整，“以确保他继续为大会和竞选的剩余部分提供保护。”
“我相信我们的特勤局RNC协调员和我们的合作伙伴已经制定了安全计划，在周六的枪击事件后，我们已经审查并加强了该计划，”Cheatle说。“国家特别安全事件的安全计划旨在具有灵活性。随着会议的进行，根据总统的指示，特勤局将不断调整我们的行动，以确保会议与会者、志愿者和密尔沃基市的最高安全水平。”
New details emerge in Trump assassination attempt investigation
After conducting more than 100 interviews, searching the suspect's home and vehicle, and cracking into his cellphone, FBI investigators were still searching on Tuesday for the motive that led a 20-year-old Pennsylvania manto attempt to assassinatea former president.
As fallout continued on the security failure that led to the attempt on former President Donald Trump's life, the Pennsylvania State Police said Tuesday afternoon that it was not responsible for securing the area where the gunman opened fire from a rooftop about 400 feet from the rally stage, hitting Trump's right ear, killing a bystander and wounding two others.
The state police said in a statement that it provided "all resources" to the Secret Service -- including 30 to 40 troopers to assist with securing the inside perimeter of the campaign rally venue in Butler Township, Pennsylvania -- but "was not responsible for securing the building or property" outside the security perimeter where the would-be assassin opened fire.
In anexclusive interview with ABC News, U.S. Secret Service Director Kimberly Cheatle confirmed that local police were present inside the building at the same time the shooter was on the roof firing at Trump. Cheatle also said that local authorities were tasked with securing that building.
"In this particular instance, we did share support for that particular site and that the Secret Service was responsible for the inner perimeter. And then we sought assistance from our local counterparts for the outer perimeter," Cheatle said.
Feds warn of "retaliatory" acts
As the investigation continued, officials with the FBI, the agency spearheading the probe, and the Department of Homeland Security warned late Monday about the potential for "follow-on" or "retaliatory" acts.
"We cannot rule out the possibility that some DVEs or other actors may attempt follow-on or retaliatory acts of violence in response to this assassination attempt," the two agencies said in a joint bulletin, using an acronym for "Domestic Violent Extremism."
A cellphone used by the alleged assailant,Thomas Matthew Crooks, was sent to Quantico, Virginia, where FBI technicians gained access to its contents, officials said Monday.
Investigators did not immediately say if the analysis of the phone being conducted at the FBI laboratory yielded any clues on what drove the suspect to commit such a brazen attempt on Trump's life -- a key focus of the inquiry.
But investigators were expected to begin an analysis of the device's contents as they focused on search for a motive for the shooting that left one rallygoer dead and two others wounded, an FBI official said.
FBI officials also said a search of the suspect's vehicle and home in Bethel Park, Pennsylvania, about 53 miles south of where Saturday's campaign event occurred in Butler Township, has been completed. According to an FBI and Department of Homeland Security bulletin, two improvised explosive devices were found in Crooks' car and one in his home.
"Over the last several months, Crooks received several packages, including some marked as possibly containing hazardous material, according to a review of his shipping history," the bulletin said.
And the bulletin revealed that on the day of the shooting, Crooks purchased 50 rounds of ammunition prior to going to the rally in a gun shop in Bethel Park, Pennsylvania. It is unclear what shop the bulletin was referring to.
Suspect asked to borrow dad's AR-15-style rifle
ABC News learned that on the day of the shooting, Crooks told his father he wanted to go to a shooting range and asked if he could borrow his dad's AR15-style rifle, said a source familiar with the matter. Since the father had occasionally allowed Crooks to go target shooting with the semiautomatic firearm, he didn't think anything was suspicious when he let him use the rifle again on Saturday, the source said.
Investigators said Crooks used the rifle in the attempted assassination of Trump. The source also said that Crooks recently purchased ammunition online, as well as in-person.
Law enforcement has also been canvassing local gun shops in the Pittsburgh area for any information they can glean about Crooks' ammunition buying habits, both purchased in-store and shipped online. Those shops include Allegheny Arms& Gun Works in Bethel Park, roughly a mile from the Crooks' residence.
"As a responsible member of our community it is our prerogative to cooperate with law enforcement in every way," Allegheny Arms said in a statement to ABC News. "We are thankful that President Trump was not assassinated and our hearts and prayers go out to all victims of this horrible incident. Out of respect for the ongoing investigation and that of those affected we will not make any further statements."
FBI investigators have conducted nearly 100 interviews of law enforcement personnel, event attendees and other witnesses as they work to get to the bottom of what transpired at the rally, bureau officials said in a statement.
"The FBI has received hundreds of digital media tips which include photos and videos taken at the scene and we continue to review incoming tips," the FBI said in its statement.
Motive still unknown
The federal investigation into the attempted assassination of the former president is focused on the suspected gunman's motives for the crime and whether he was aided by others, authorities said.
In his address to the nation from the Oval Office Sunday night, President Joe Biden said it's unclear what prompted the suspect, identified as Crooks, to attempt such a brazen broad-daylight attempt on Trump's life.
"We don't know his opinions or affiliations. We don't know whether he had help or support or if he communicated with anyone else," Biden said. "Law enforcement professionals, as I speak, are investigating those questions."
Trump was about 10 minutes into his speech at an outdoor rally Saturday afternoon when shots rang out, followed by screams. The former president clutched his bleeding right ear and dove to the ground as Secret Service agents swarmed him, the FBI said in a statement late Sunday.
A bystander, 50-year-old Corey Comperatore, who worked as a local volunteer firefighter, was killed while trying to protect his family from the gunfire, according to Pennsylvania Gov. Josh Shapiro, who called Comperatore "a hero." Two other rallygoers shot in the incident were identified by the Pennsylvania State Police as 57-year-old David Dutch of New Kensington, Pennsylvania; and 74-year-old James Copenhaver of Moon Township, Pennsylvania.
Dutch and Copenhaver were listed in stable condition, officials said.
"The FBI has not identified a motive for the shooter's actions, but we are working to determine the sequence of events and the shooter's movements prior to the shooting, collecting and reviewing evidence, conducting interviews, and following up on all leads," the bureau said in the statement.
The building the suspect fired from was outside the security perimeter but was fewer than 400 feet from the podium where Trump was speaking, officials said.
Investigators have begun retracing the suspect's steps in an attempt to figure out how Crooks could have made it up onto the roof, which had been swept before the event, law enforcement sources told ABC News.
Just moments before the shooting, witnesses in the crowd attempted to point out the armed suspect to Secret Service agents. A Butler Township police officer climbed up on the roof and tried to engage the gunman who turned his weapon to the officer, causing him to retreat back down, Butler County Sheriff Michael T. Slupe told ABC News, adding that he was informed of the encounter by other law enforcement officials.
After being interrupted by the officer, the suspect proceeded to open fire in the direction of Trump, just as the presumptive GOP presidential nominee turned his head to look at a Jumbotron, a move Trump would later claim possibly saved his life.
The gunman was shot and killed by one of four Secret Service counter snipers positioned on rooftops around the rally, officials said.
The FBI is leading the investigation of the shooting.
FBI Director Christopher Wray called the assassination attempt on Trump "nothing short of an attack on democracy and our democratic process."
Homeland Security Secretary says shooter should have never gotten a clear shot
U.S. Secretary of Homeland Security Alejandro Mayorkas, who oversees the U.S. Secret Service,said Mondayon ABC's "Good Morning America" that the 20-year-old gunman who attempted to assassinate Trump should never have been able to get a clear line of sight on the former president.
In an interview on "Good Morning America" with George Stephanopoulos, Mayorkas said the shooting should not have happened.
"George, a direct line of sight like that to the former president of the United States should not occur," Mayorkas said.
Mayorkas said an independent investigation announced by Biden on Sunday is already underway with a focus on the motive of the alleged gunman, identified as Thomas Matthew Crooks, who managed to get up on the roof of an agriculture building about 400 feet from the stage where Trump was speaking, investigators said.
"We have to learn everything about the assailant who, of course, the Secret Service neutralized," Mayorkas said. "We are going to really study the event independently and make recommendations to the Secret Service and to me so that we can assure the safety and security of our protectees which is one of our most vital missions in the Secret Service."
Mayorkas said it is important to have an "independent body" outside the Department of Homeland Security for "the integrity of the investigative process and the conclusions reached and the recommendations made have the full confidence of the government and the American public. And we intend to be transparent with respect to the findings and recommendations of the independent review."
Biden promised an independent investigation in the aftermath of the assassination attempt against Trump. Biden said the results of the independent investigation will be made public.
During the interview, Mayorkas rejected the "false" assertion that the Secret Service rebuffed requests for additional resources to Trump's security detail.
"We keep very close watch on a very dynamic threat environment. The president, the former president, are commonly consistently under threat," Mayorkas said. "We take every single threat seriously. We make security adjustments as are warranted. We had enhanced security for the former president, beginning in June. We had not received any requests for additional security measures that were rebuffed. That is false."
Biden also ordered the Secret Service to review security plans for the Republican National Convention in Milwaukee, which is scheduled to start on Monday. Mayorkas said he is confident in the security plan for the RNC.
Suspicious devices found in suspect's car and home
FBI investigators, led by the Pittsburgh Field Office, have searched Crook's home in Bethel Park, a suburb of Pittsburgh. They've also searched his vehicle, which was at the scene of the shooting in Butler, the FBI said.
"Suspicious devices found at both locations have been rendered safe by bomb technicians and are being evaluated at the FBI Laboratory," the FBI said.
The AR-15-style rifle allegedly used by Crooks had been legally purchased in 2013 by the suspect's father, law enforcement sources told ABC News. The family is cooperating with the investigation.
Secret Service director stresses getting to the bottom of what happened
In a statement released on Monday, U.S. Secret Service Director Kimberly Cheatle stressed that her agency is focused on learning how the gunman got a clear shot of Trump. She also expressed faith in the Secret Service's security plan for the RNC.
"The Secret Service is working with all involved Federal, state and local agencies to understand what happened, how it happened, and how we can prevent an incident like this from ever taking place again," Cheatle said. "We understand the importance of the independent review announced by President Biden yesterday and will participate fully."
Since the assassination attempt, Cheatle said she has been in constant contact with Secret Service personnel in Pennsylvania.
The FBI has taken over as the lead of the investigation.
"I have also been coordinating with the protective detail for former President Trump and have briefed President Biden on the details of the incident," Cheatle said.
Cheatle said the attempt on Trump's life "has understandably led to questions about potential updates or changes to the security" at the RNC. She said the agency has also implemented changes to Trump's security detail since the shooting "to ensure his continued protection for the convention and the remainder of the campaign."
"I am confident the security plan our Secret Service RNC coordinator and our partners have put in place, which we have reviewed and strengthened in the wake of Saturday's shooting," Cheatle said. "The security plans for National Special Security Events are designed to be flexible. As the conventions progress, and in accordance with the direction of the president, the Secret Service will continuously adapt our operations as necessary in order to ensure the highest level of safety and security for convention attendees, volunteers and the City of Milwaukee."
