At 18:06 on 28 April, as President Minh finished his acceptance speech three A-37 Dragonflies piloted by former Republic of Vietnam Air Force (RVNAF) pilots, who had defected to the Vietnamese People's Air Force at the fall of Da Nang, dropped six Mk81 250 lb bombs on Tan Son Nhut Air Base damaging aircraft. RVNAF F-5s took off in pursuit, but they were unable to intercept the A-37s. C-130s leaving Tan Son Nhut reported receiving PAVN .51 cal and 37 mm anti-aircraft (AAA) fire while sporadic PAVN rocket and artillery attacks also started to hit the airport and air base., C-130 flights were stopped temporarily after the air attack but resumed at 20:00 on 28 April.