A Massachusetts man was arrested Tuesday at the U.S. Capitol after police discovered he had taken a full tour while having a gun tucked into the waistband of his pants.

The man was arrested outside the Library of Congress, where it was learned that he’d toured the Capitol while possessing a 9mm handgun, ABC News reported Thursday.

Police in Carlisle, Massachusetts, alerted the officials in Washington that the man, who had expressed suicidal ideations on social media, was headed to Washington, D.C., and that he had a gun.

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