A small aircraft veered off the runway and hit two helicopters while attempting to take off in Nepal's Lukla airport on Sunday, killing three people.
The plane, operated by Summit Air, was not carrying passengers at the time of the incident.
Officials said the cause of the incident was not immediately known.
"Two people died on the spot and the third one died while undergoing treatment in a hospital in Kathmandu," an airport official told Reuters.
Three more people are being treated for injuries at nearby hospitals.
Lukla, which is also known as the gateway to the Mount Everest.

US, India agree on trade deal and lower tariffs, says Trump
Israel reopens Gaza's Rafah border crossing to Egypt, with limits
US envoy Witkoff to visit Israel, meet Netanyahu, Israeli officials say
Russian drone strike kills 12 miners in Ukraine
Singapore to launch space agency in response to global investment surge
Five-year-old boy returns to Minnesota after ICE release
Reopening of Gaza's Rafah crossing expected Monday
Winter storm death toll in United States reaches 90
