WATCH: US strategic bombers flew so low over Washington DC that they set off car alarms across the city. A B-1B Lancer

WATCH: US strategic bombers flew so low over Washington DC that they set off car alarms across the city. A B-1B Lancer, B-2 Spirit, and B-52 Stratofortress flew in formation over the National Mall alongside F-35s and F-22s. The flyover was part of the Freedom 250 Grand Prix celebrations marking America's 250th anniversary. Air Force One also made a low pass escorted by four F-35s.