Greek and Turkish fighter jets have collided in mid-air over the southern Aegean sea, Greek officials say.
The collision and crash happened near to the island of Karpathos, they were quoted as saying.
A search and rescue effort is under way but the pilots' fate and the cause of the collision are not yet known.
In the past, Greece and Turkey have come close to armed conflict in the Aegean, where they dispute airspace and territorial waters.