At least 18 people were killed after a small plane skidded off the runway in Nepal’s capital Kathmandu on Wednesday, local officials said.

The pilot, who has been hospitalized, is the sole survivor of the Saurya Airlines crash, said Gyanendra Bhul, a spokesperson for Tribhuvan International Airport. All those on board – 18 Nepalis and a Yemeni citizen – were employees of the carrier, according to police.

Images from Nepal police showed thick smoke billowing from the burning aircraft on the the airport runway.

The aircraft crashed during takeoff from Kathmandu to the city of Pokhara around 11 a.m. local time, Bhul said. The plane was en route for technical maintenance, he added.

“Rescue efforts were started immediately and the situation was brought under control,” the aviation authority said.

The crash once again highlights the dangers of air travel in Nepal, a country often referred to as one of the riskiest places to fly due to multiple factors including its mountainous terrain.

Aircraft with 19 seats or fewer are more likely to have accidents due to these difficulties, according to a 2019 safety report from the Civil Aviation Authority.

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