According to reports, they were members of a wedding party.

Sixty-four people were hurt in the accident.

According to rescue and police officials, 12 passengers passed away at the spot while two others expired at the hospital on Sunday. The driver of the bus was also killed in the fatal accident, reports Dawn News.

The injured people were rushed to  Tehsil Headquarters Hospital for treatment.

Chakwal Deputy Commissioner Quratulain Malik told Dawn.com that the wedding party was going back to Lahore from Islamabad.

“The vehicle was passing through a curved patch of the Islamabad-Lahore motorway when its brakes failed and the bus smashed into two cars coming from the opposite side,” she said.

“Six passengers received critical injuries and they were rushed to Rawalpindi,” the DC added.

Dr Atique Ahmed, the district in charge of Rescue 1122, said a car was still stuck under the bus.

“The bus was damaged to such an extent that we had to cut it to take out the injured persons and dead bodies,” he told Dawn News.

A case has been registered at the Kallar Kahar police station.

A police official, while talking to Dawn.com, said that the accident occurred on the dangerous patch of the motorway which passed through the hilly area of Salt Range near Kallar Kahar.

“Most accidents occur on this patch as it is curvy and sloppy,” he said, adding that drivers not accustomed to Islamabad-Lahore Motorway were prone to meet such fatal mishaps.