Two firefighting helicopters collided mid-air on Sunday while battling a wildfire in the Psatha area west of Athens, and all four crew members were recovered after the crash. Video footage showed one helicopter striking the other's propellers, causing it to burst into flames and crash to the ground. The Greek fire department said two crew members were recovered safely and two were unconscious. A large-scale search and rescue operation was launched near the village of Psatha. Nearly 500 firefighters and 23 aircraft are involved in fighting the blaze. Prime Minister Kyriakos Mitsotakis warned of "extremely difficult" days ahead, and one expert referred to the fires as a megafire. The wildfires are part of record-breaking summer heat across Europe, with blazes also raging in France and Spain and forcing evacuations.