The United States Capitol was placed on lockdown Thursday afternoon following reports of shots fired in the vicinity of the chamber. At least one Capitol Police officer was injured.

The FBI was responding to the unconfirmed reports of shots, and a helicopter landed in front of the Capitol. A message from the Capitol Police ordered anyone in a House office to “shelter in place.”

“Close, lock and stay away from external doors and windows,” the message said.

The House recessed, and the Senate went into a quorum call — dispensing momentarily with its official business — shortly thereafter.

Source: NBC News – NBC News: U.S. Capitol placed on lockdown