Mangan (North Sikkim), Sept. 20: An engineer with the Border Roads Organisation was killed on Sunday when an avalanche of boulders triggered by the quake crashed into their bus.

A senior BRO official identified the deceased as Vijay Kumar from Punjab. Kumar was in his fifties.

According to a BRO official, 17 junior engineers were returning to their base at Manuel near Mangan, the district headquarters of North Sikkim, when the boulders came hurtling down between Pegong and Thung.

“The junior engineers along with the driver, his helper and a couple of other passengers were returning to their base in a BRO bus. Boulders crashed into the bus when the quake occurred,” the official said.

An engineer, identified as S.P. Singh from Uttar Pradesh, suffered serious injuries. The others scampered to safety.

As Singh couldn’t be moved, the others left him under the crumpled bus. They reached the BRO base, 13km away, at night. Rescue workers reached Singh this morning. The engineer was later airlifted to Siliguri in an army helicopter.