It was a jammed stabilizer. Aircraft pitched down to the ground, they were flying around 400-500 feet AGL which isn't a lot of altitude in giving out a clear margin to eject if the aircraft suddenly pitches down. My dad was in one of the F-16s from No. 14 Squadron ahead of the Mirage group. The stick jammed, causing the aircraft to pitch down, Saeed Iqbal ejected but the parachute did not deploy fully. It was either the A-5s or the F-6s that saw the crash and the lead for A-5s gave the call that an aircraft has crashed once all the aircraft were clear of the parade ground.
The second one was very tragic. His wingmen were screaming to him to eject but he didn't make it.