政治领导人要求周三晚些时候知道为什么执法部门没有更好地巩固美国国会大厦，因为极端组织几天来一直在网上谈论他们的计划反应激烈认证总统的最后一步唐纳德·特朗普的2020年选举失败。

“这么多暴徒是怎么从这么多方向进入这栋大楼的?是怎么攻破的?”加州民主党人、众议院司法委员会成员、众议员卡伦·巴斯(Karen Bass)告诉美国广播公司新闻。“你看到人们用绳子爬上大楼。你(通常)甚至不能带着钱包进这栋楼。”

国土安全部代理副部长肯·库茨内利(Ken Cuccinelli)告诉美国广播公司新闻(ABC News)，他“非常惊讶”在电视上看到一个例子，在没有明显警察抵抗的情况下，国会大厦的门被打破——尽管美国国会大厦的警察带着盾牌，在其他地方抵挡住了手持胡椒喷雾的暴徒的力量。

“我们执法部门的所有人已经为此计划了几天，”库茨内利说。“这一切都将得到分析。这真的是必须要看的。”

记者未能联系到保护这座神圣建筑的牵头机构美国国会警察局置评。

极端组织没有明确指出特朗普总统的支持者暴徒对国会大厦发动袭击的可能性。但美国广播公司新闻节目(ABC News show)获得的内部公告和情报报告显示，在周三前所未有的违规之前，社交媒体上广泛流传着红旗和警告标志，并提请执法部门注意。

Win Mcnamee/Getty Images

2021年1月6日，华盛顿特区，支持唐纳德·特朗普总统的抗议者闯入美国国会大厦

在联邦执法机构中广泛传播的情报报告包括许多社交媒体帖子，纵容类似于周三发生的不守规矩的行为。在线极端主义监督组织SITE月29日的一份报告引用了一名右翼活动人士的话说，“我真的不在乎人们是否闯入国会，把这些政客拖到街上。”

报道称，在报道中引用的一段视频中，煽动者“鼓励彼此武装参加活动，并为暴力做准备”。

该报告的结论是，极端极右和阴谋团体将利用1月6日的亲特朗普抗议活动对在线威胁采取行动。

美国广播公司新闻撰稿人、前联邦调查局特工布拉德·加瑞特说:“根据相当直接的情报，数千名愤怒的人将会前来展示他们的存在——包括容易暴力的团体——执法部门完全没有准备好处理今天的事件。”。"这是一次惊人的执法失败。"

在周三华盛顿“停止偷窃”集会之前的几天里，联邦和地方执法机构公开谈论他们所隐藏的安全问题。一名了解情况的联邦官员告诉美国广播公司新闻，对暴力的担忧不是秘密。这位官员说，不清楚为什么没有提前通知就采取更多行动。

乔治敦大学法学教授、前联邦检察官玛丽·麦考德(Mary McCord)表示，保护美国最神圣办公室的联邦机构在袭击国会大厦之前已经收集了大量信息。

“我不知道为什么国会警察如此措手不及，”麦科德说。

国会议员也对抗议人群轻松穿过国家广场，越过朴素的防御工事，进入国会大厦感到震惊。众议院行政委员会主席佐伊·洛夫格伦是加利福尼亚州的民主党人，他说这一违规行为“引起了严重的安全担忧”

她说:“我打算让众议院行政委员会与两党的众议院和参议院领导层合作，解决这些问题，并在未来几天内审查回应。”

德鲁·安格雷尔/盖蒂影像公司

2021年1月6日，在华盛顿特区举行的国会联席会议上，美国国会警察站在众议院会议厅外拘留抗议者。

众议员巴斯是国会黑人核心小组的前主席，她告诉美国广播公司新闻，她认为“需要进行全面调查”。

“我在国会大厦一直感到安全，”巴斯说。“我从来没有意识到这是我需要害怕的地方。”

杰·约翰逊曾在奥巴马总统时期担任国土安全部部长，他说，他相信“可能有足够的安全措施来防止这种情况发生。”

美国广播公司新闻撰稿人加勒特说，周三的违规不仅是可以预见的，而且在一个如此习惯于大规模集会的城市，这应该是一次例行的执法演习，以加强对它的防范。

加勒特说:“对于执法机构来说，这应该是一次经典的防暴行动，在执法机构中，预先建立了一个周界，将人群从他们的目标位置疏导出去，并从国民警卫队或其他联邦机构调用增援部队。”“我只是无法想象国会警察没有通过那次演习。”

美国前国会警察局长金丁告诉美国广播公司新闻，最重要的是，这一天的事件“在许多层面上都是如此悲惨，简直难以形容。”

丁说，对于一个致力于“保护那个地方、那些人和民主进程”的部门来说，这一违规行为无疑是“最糟糕的噩梦”。...毫无疑问，还有很多工作要做。”

Missed warning signs and failure to fortify US Capitol bewilder experts

Political leaders demanded late Wednesday to know why law enforcement did not better fortify the United States Capitol after extremist groups for days chattered online about their plans toreact violentlyto the final formal step of certifying PresidentDonald Trump's2020 election defeat.

"How did so many rioters get into this building from so many directions? How was it breached?" Rep. Karen Bass, a California Democrat and House Judiciary Committee member, told ABC News. "You saw people with ropes scaling the building. You [normally] can't even get into this building with a purse."

Ken Cuccinelli, the Department of Homeland Security's acting deputy secretary, told ABC News he was "quite surprised" to watch on television an instance in which the doors of the Capitol were breached with no obvious police resistance -- even as U.S. Capitol Police officers with shields withstood the force of a mob armed with pepper spray at other locations.

"All of us in law enforcement have been planning for this for a number of days," Cuccinelli said. "This is all going to get analyzed. It really is going to have to be looked at."

U.S. Capitol Police, which is the lead agency in protecting the hallowed structure, could not be reached for comment.

The potential for a mob of President Trump's supporters to launch an assault on the Capitol was not explicitly laid out by extremist groups. But there were red flags and warning signs widely circulating on social media and flagged to law enforcement in the run-up to Wednesday's unprecedented breach, internal bulletins and intelligence reports obtained by ABC News show.

Intelligence reports widely circulated among federal law enforcement agencies included scores of social media posts condoning unruly actions similar to those that unfolded Wednesday. A Dec. 29 report by the online extremism watchdog group SITE quoted a right-wing activist saying, "I really don't care if people break into Congress and drag these politicians out in the streets."

In one video cited in the report, agitators "encouraged each other to attend the event armed and prepare for violence," the report said.

The report concluded that extremist far-right and conspiratorial groups would use the Jan. 6 pro-Trump protest to act on online threats.

"Based on the fairly straightforward intelligence that thousands of angry people were going to come and show their presence -- including groups prone to violence -- law enforcement was totally ill-prepared to handle today's incident," said ABC News contributor Brad Garrett, a former FBI special agent. "This was a phenomenal law enforcement failure."

Federal and local law enforcement were openly talking about security concerns they harbored in the days leading up to Wednesday's "Stop the Steal" rally in Washington. One federal official briefed on the situation told ABC News that concerns about violence were not a secret. The official said it's not clear why more action was not taken with so much advance notice.

Mary McCord, a Georgetown Law professor and former federal prosecutor, said federal agencies that protect the nation's most sacred and hallowed offices had gathered ample information ahead of the assault on the Capitol.

"I don't know why the Capitol Police were so unprepared," McCord said.

Her alarm at the ease with which the protest mob moved across the National Mall, over modest fortifications, and into the Capitol, was shared by members of Congress. Committee on House Administration Chairperson Zoe Lofgren, a California Democrat, said the breach "raises grave security concerns."

"I intend to have the Committee on House Administration work with the bipartisan House and Senate leadership to address these concerns and review the response in coming days," she said.

Rep. Bass, a former chair of the Congressional Black Caucus, told ABC News she believes "a full investigation needs to happen."

"I have always felt safe at the Capitol," Bass said. "It would have never dawned on me that this is the place where I needed to be afraid."

Jeh Johnson, who served as Secretary of Homeland Security under President Barack Obama, said he believes "there could have been adequate security in place to prevent this from happening."

Not only was Wednesday's breach predictable, said ABC News contributor Garrett, but in a city so accustomed to mass gatherings, it should have been a routine law enforcement exercise to fortify against it.

"This should have been a classic anti-riot operation for a law enforcement agency, where a perimeter is set up in advance, crowds are channeled away from their target location, and reinforcements are called in from the National Guard or other federal agencies," Garrett said. "I just can't imagine that the Capitol Police didn't go through that drill."

Former U.S. Capitol Police Chief Kim Dine told ABC News that, more than anything, the day's events were "so tragic on so many levels, it literally is hard to describe."

Dine said the breach was no doubt "the worst nightmare" for a department dedicated to "protecting that place, those people, the democratic process. ... There's no question about it, there's a whole lot of work to be done."