WASHINGTON, (Reuters) – The U.S. Federal Aviation Administration told Congress that it took “immediate actions” to make sure U.S. Capitol Police were aware of any unusual aerial events following an April 20 small plane flight which triggered a security concern.

Billy Nolen, FAA Acting Administrator, stated in a letter sent to Congress that they will give advance notice of special-event flights in Washington.

This letter stated that the agency believed “this would provide all of our Interagency Partners with the additional time necessary to reduce any confusion.”

One-engine single-engine plane carrying the U.S. Army’s Golden Knights demonstration parachute team was misinterpreted as a threat to security and the U.S. Capitol had to be evacuated.