POKHARA, Nepal (AP) — Nepal began a national day of mourning Monday, a day after a plane crashed while attempting to land at a newly opened airport, killing at least 68 of the 72 people aboard. Rescue workers rappelled down a 300-meter (984 feet) gorge to continue the search. Two more bodies have been found Monday morning.

The army, police and rescue workers are also scouring the debris for the flight data recorder. It remains unclear what caused the crash, the Himalayan country’s deadliest airplane accident in three decades.

A witness who recorded footage of the plane’s descent from his balcony said he saw the plane flying low before it suddenly veered to its left. “I saw that and I was shocked… I thought that today everything will be finished here after it crashes, I will also be dead,” said Diwas Bohora. After it crashed, red flames erupted and the ground shook violently, like an earthquake, Bohora said. “I was scared. Seeing that scene, I was scared.”

Another witness said he saw the aircraft spinning violently in the air after it began descending to land, watching from the terrace of his house. Finally, Gaurav Gurung said, the plane fell nose-first towards its left and crashed into the gorge.