The following might help:
BOMB DISASTERS IN IRAK.
2 AEROPLANES BLOWN UP.
(From Our Correspondent.)
Basra, Oct. 5 (1921)
A remarkable flying accident is reported from Nasiriyah resulting in the death of Flying Officer Maitland Hyslop and Second Air Craftsman Plummer.
Mr Hyslop's aeroplane, which was carrying bombs, attained a height of 40ft when one of the bombs exploded.The machine immediately burst into flames and crashed, killing both men instantaneously.
Three minutes later the second bomb-carrying aeroplane rose from the same aerodrome and a bomb exploded at an altitude of 100ft, causing a second crash. Flying Officer B. E. Herbert escaped with a severe concussion and other injuries, while his mechanic got a black eye.
I am informed that the second explosion was not caused by the first. An exhaustive inquiry is now in progress.
See: The Times October 8. 1921 p.7
I believe the aircraft were possibly DH.9As from No.84 Sqn. Maybe someone with a copy of the Air Britain DH.9 File, can check and see if there are any matching incidents. Date, possibly 30-9-1921.
I have checked, Flat Out:The Story of 30 Squadron Royal Air Force/Hamlin. Can't find a matching incident there.