A Libyan military helicopter crashed during an airshow in the eastern city of Benghazi on Thursday killing two crew members and wounding a third, an airforce official told AFP.

The accident occurred while a military parade was underway at the Benina airbase in Benghazi, Libya's second city and cradle of the 2011 uprising that toppled dictator Moamer Kadhafi.

"A lieutenant colonel and a lieutenant were killed ... while a third crew member, a lieutenant, was seriously wounded," airbase commander Colonel Nasser Busnina, said.

"It seems that the pilot was more eager than necessary" during the airshow, Busnina said.

An army spokesman said the aircraft was a Mi-35 attack helicopter that had recently undergone a checkup.