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U.S. Capitol Police on Thursday are investigating what they called “an active bomb threat” from a truck parked near the Library of Congress, as staffers at a House office building were ordered to evacuate.

The Capitol Police Twitter feed warned people to “please stay away from this area.”

People at the Cannon House Office Building received an alert telling them to leave that building and relocate to the Longworth House Office Building.

“This is an ongoing investigation,” a follow-up tweet from Capitol Police said.

“We are monitoring this situation closely and will update this account as we get information we can release.”

Agents from the Bureau of Alcohol, Tobacco and Firearms were assisting Capitol Police, according to the ATF’s Twitter feed.

Congress is currently in recess.

This is breaking news. Please check back for updates.