At least 22 people were killed and 51 others injured when a passenger bus fell into a ravine in Attock district of Pakistan's Punjab province on Wednesday night, police said.

Zeeshan Afzal, an officer from Punjab Highway Patrolling Police, told Xinhua that the accident happened at around 10.00 p.m. in Dhok Pathan area of Pindi Ghep region of Attock.