警方官员周四告诉美国广播公司新闻，一名马萨诸塞州男子在参加完美国国会大厦的游览后，于周二离开附近的国会图书馆时被发现携带枪支。
周一，马萨诸塞州卡莱尔的警方警告华盛顿当局，一名持枪男子正在前往华盛顿，他在社交媒体上表达了自杀想法。
消息人士称，美国特勤局和华盛顿特区大都会警方周二凌晨在华盛顿一家酒店发现了这名男子，并对他进行了采访。他们搜查了一把枪，没有发现武器，当时没有采取进一步的行动，他们说。
当天晚些时候，这名男子通过了国会警察磁力计检查，进入了国会游客中心。根据美国国会大厦警方的一份声明，磁力计发出警报，“一名警察进行了第二次手搜查，这名男子被允许进入大楼”。
通过安检后，国会警察注意到了他的存在，并发布公告要求注意该男子。执法部门消息人士称，他在国会图书馆外参观完国会后不久，他们找到了他，发现他的腰带里有一把9毫米手枪。
当局表示，嫌疑人因“非法活动、无证携带手枪、持有未注册枪支、非法持有弹药和拒捕”而被捕国会警察声明说，该案件目前正在美国检察官办公室处理。
在国会大厦游客中心磁强计处进行筛查的官员“在USCP职业责任办公室对该官员的搜查行为进行行政调查期间被停职。”
根据国会警察的说法，没有迹象表明他打算对国会造成任何伤害。但消息人士告诉ABC新闻，一名可能有自杀倾向的男子能够带着枪在附近的公众和国会成员中参观国会。
“已经下令对这一事件进行全面审查，并强制进行安全检查的复习培训，因此这种情况不会再发生，”国会警察在他们的声明中说。
周四，国会成员听取了形势简报。
Security breach at US Capitol: ABC News exclusive
A Massachusetts man was found to be carrying a gun after attending a tour of the U.S. Capitol as he left the nearby Library of Congress on Tuesday, police officials told ABC News on Thursday.
Authorities in Washington were alerted by police in Carlisle, Massachusetts, on Monday that a man with a gun who had expressed suicidal ideations on social media was headed to Washington.
The U.S. Secret Service and Washington, D.C. Metropolitan Police found the man in a Washington hotel early Tuesday morning and interviewed him, sources said. They searched for a gun and found no weapon and no further action was taken at that time, they said.
Later that day, the man went through a Capitol Police magnetometer screening and entered the Capitol Visitor Center. The magnetometer sounded an alarm and "an officer performed a secondary hand search, and the man was let into the building," according to a statement from U.S. Capitol Police.
After getting past security, Capitol Police were alerted to his presence and issued a bulletin to be on the lookout for the man. They located him after he had completed the full tour of Congress outside the Library of Congress a short time later and found that he had a 9mm handgun in his waistband, law enforcement sources said.
Authorities said the suspect was arrested for "Unlawful Activities, Carrying a Pistol Without a License, Possession of an Unregistered Firearm, Unlawful Possession of Ammunition, and Resisting Arrest." The case is currently with the U.S. Attorney's Office, the Capitol Police statement said.
The officer who performed the screening at the magnetometer at the Capitol Visitor Center "is suspended while the USCP's Office of Professional Responsibility is conducting an administrative investigation into the officer's performance of that search."
There is no indication he intended to cause any harm to harm the Congress, according to Capitol police. But sources told ABC News that a man who was possibly suicidal was able to take a full tour of Congress with a gun with members of the public and Congress nearby.
"A full review of this incident has already been ordered, as well as mandatory refresher training on security screening, so this never happens again," Capitol Police said in their statement.
Members of Congress were briefed on the situation on Thursday.
