Two swooping Su-27 fighter jets
Two of the same Sukhoi Su-27 fighter jets that collided at Zhukovsky airfield

Two Russian Su-27 fighter jets have collided during rehearsals for a flying display at a big air show near Moscow.

"The jets collided about 5km (3 miles) from Zhukovsky airfield," RIA news agency quoted a witness as saying.

Two pilots from the elite Russian Knights aerobatic team parachuted to safety, Russian media said.

But the fate of a third pilot is unclear, with unconfirmed reports that he died in the accident, RIA-Novosti and Interfax news agencies said.