In Nepal, a passenger plane with 22 people on board has disappeared from radar during a domestic flight.
Tara Air announced that contact with the Twin Otter machine was lost shortly after it took off from the western city of Pokhara on Sunday morning.
The plane, with 19 passengers and three crew members on board, was en route to Jomsom, a company spokesman said.
Bad weather hinders search operations
Jomsom is a popular mountaineering destination in the Himalayas.
The place is only about 20 minutes away from Pokhara by plane.
A spokesman for the Nepalese Interior Ministry said two helicopters had been dispatched to search for the plane.
However, the visibility in the area is very poor.
"The bad weather will probably hamper the search operation," said the ministry spokesman.
Aviation in Nepal has been booming for years, but safety standards are low due to inadequate staff training and poor maintenance of the machines.
The European Union has therefore banned all Nepalese airlines from its airspace.
In addition, the Himalayan state is home to some of the most remote and difficult airstrips.
In March 2018, a plane operated by Bangladeshi airline US-Bangla crashed near the international airport in the capital, Kathmandu.
51 people died in the process.