There was a report of "multiple" shots being fired in Washington, D.C, Thursday, where staffers were told by Capitol Hill police to "shelter in place."

Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building.

People standing outside the Supreme Court across the street from Congress were hurried into the court building by authorities.

U.S. Capitol police said they had received reports of gunshots and one police officer has been injured.

Senate Majority Leader Harry Reid told a CNN reporter that at least one person was injured.

[ UPDATES: U.S. Capitol thrown into panic after reports of shots fired ]

The Associated Press contributed to this report.