Two pilots have been killed after a Greek military F-4 Phantom aircraft crashed during an air show in Tanagra, according to local media.
Greek public broadcaster ERT reported on Saturday that the aircraft went down shortly before 1200GMT under circumstances that were not immediately clear.
An explosion occurred immediately after the crash, while an ERT reporter at the scene said the aircraft suddenly began losing altitude before hitting the ground.
The crash occurred only minutes after the Greek Air Force aerial demonstration had begun and was witnessed by thousands of visitors attending the event.
In a later report, Greek daily To Vima said two pilots were found dead; however, it remains unclear whether the aircraft's ejection-seat system had been activated.
The aircraft, which belonged to the 117th Combat Wing based in Andravida, was flown by a captain and a lieutenant colonel, it added.
Video footage showed a column of black smoke rising a few hundred metres from spectators watching the air show.
Two helicopters battled the fire on the spot.
Loudspeakers at the air base were urging people to leave the area, according to ERT.
The aircraft had just taken off when it suddenly lost altitude and crashed, said a journalist from public broadcaster ERT who was at the scene.
There was an explosion immediately after the crash, which happened before thousands of visitors watching the annual "Athens Flying Week".
Defence Minister Nikos Dendias cancelled a trip to Thessaloniki's International Fair to visit the scene of the accident.
