Tragedy has hit trekkers in Nepal for the second time in under a week. All 19 people on board a plane bound for the Everest region died when the Sita Air flight crashed and burned soon after taking off from Kathmandu this morning, reports the AP. Authorities say seven passengers were British and five were Chinese. The other four passengers and the three crew members were from Nepal. Witnesses said they saw the Dornier light aircraft in flames before it crashed into a field just 500 yards from the airport. On Sunday, nine people were killed when an avalanche hit a climbers' camp in northern Nepal.