Two Greek air force pilots were found dead after their twin-seat F-4 Phantom crashed during a low-altitude maneuver at Tanagra air base, where thousands were attending Athens Flying Week.
The jet broke apart on impact and triggered a blaze that sent up black smoke, with early rescue efforts slowed by the fire.
Eighty-five firefighters backed by 11 water-dropping planes and helicopters worked to contain the fire, while officials said no spectators were injured and the viewing area remained clear.
Organizers canceled the rest of the weekend air show, and authorities issued an evacuation order for an area near the base.
Cyprus Defense Minister Vasilis Palmas offered condolences to Greece, underscoring the regional shock from the fatal crash 60 kilometers north of Athens.