KATHMANDU. Search and rescue operations are underway for four crew members after two firefighting helicopters collided in the air in Greece. A video has been released showing one helicopter catching fire and crashing to the ground in the Sata region near the capital Athens on Sunday. Preliminary reports suggest the accident may have occurred after the helicopters' rotors collided with each other. Both helicopters were deployed to control the severe wildfires spreading in various parts of Greece. In recent days, over a hundred houses have been destroyed due to wildfires in Greece, and residents have been evacuated from various areas...