India, Aug. 3 -- Two Greek firefighting helicopters collided in midair on Sunday as they were battling a wind-driven wildfire west of Athens, sending one aircraft crashing to the ground. Two crew members, a Greek and a Danish national, died in the crash. The collision laid bare the danger at the most volatile front of Europe's wildfire emergency. Strong winds drove flames deeper into the region of the Greek capital and forced fresh evacuations, France guarded a still-burning scar four times the size of Paris, while Spain's major fires stopped advancing. The aircraft were Bell helicopters operating over the Psatha area west of Athens, each with a two-person crew. Greek Prime Minister Kyriakos Mitsotakis expressed "sorrow for the tragic accid...