Update: Reuters is reporting that investigators have found no shooter and no injuries at the Capitol, saying the initial reports were the result of a "bad call."
"A call came in for an active shooter. It appears to be a bad call. No injuries and no shooter were located," Washington Metropolitan Police Department spokesman Hugh Carew said.
Read the original report below:
Reports say the U.S. Capitol Police have locked down and evacuated the Russell Senate Office Building after reports of an active shooter Wednesday afternoon.
The reports have not yet been confirmed and police are still investigating, NBC News reported.
"Our officers are searching in and around the Senate Office Buildings in response to a concerning 911 call. Please stay away from the area as we are still investigating. We will continue to communicate with the public here," read a tweet from the Capitol Police's official Twitter account.
Read more: Obama warns Biden of Trump's 'iron grip' in private meeting: report
In a subsequent post, Capitol Police said, “If you are inside the Senate Buildings, everyone inside should be sheltering in place as the report was for a possible active shooter. It should be noted that we do not have any confirmed reports of gunshots."
This is a developing story.