Watch! Huge sinkhole swallows bus in China; 6 killed, 10 missing

In 2016, at least three people fell into a huge sinkhole in central Henan province, which swallowed a section of road and passersby.

14 pilgrims dead, 18 injured after bus drives off highway, crashes in Nepal

Maharjan said police were investigating the cause of the crash but the roads were slippery because of winter rain.

There were no immediate reports of casualties, but a police official said the attackers had burnt tyres on the road.

However, traffic was affected for an hour on Kumbakonam-Thirupurambiyam road, sources added.

On Monday night, the government issued a notification implementing the free-ride scheme from Tuesday.

Officer Abdul Wakil said the accident happened on Sunday in the Chilas distract, on the bus' route from Skardu to the city of Rawalpindi.

The process of registering a case of accidental death was underway, police said.

The deputy commissioner directed officials to make all necessary arrangements for employees to attend work, they added.

Geymonat earlier told the BBC that the gang surrounded the couple while aboard the top deck of the bus.

One of the students can be seen with both his legs in the air as he is unable to get to the footboard.