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 scene, 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.

Missouri Sen. Claire McCaskill tweeted: Shots fired outside the Capitol. We are in temporary lockdown. read more…