US Capitol Police arrest an armed man at the North Barricade of the U.S. Capitol Building (screenshot via CNN) The US Capitol Police arrested an armed man on the US Capitol grounds on Monday. The US Capitol Police said in an alert that they were responding to “potential security concern at the North Barricade of the U.S. Capitol Building” and urged staff and other personnel to avoid the area. They later announced that they had arrested a man carrying a firearm, and an investigation remains ongoing. More from Fox: US Capitol Police Arrest Armed Man Video from the scene shows...