Rescue 1122 spokesperson Farooq Ahmed confirmed the toll to media, adding that it could further increase.
Separately, the National Highways and Motorway Police (NHMP) said in a statement that according to preliminary reports, the accident occurred at Kallar Kahar due to brake failure with a bus going to Lahore from Islamabad.
It added that the injured were being moved to a hospital for treatment.
The statement added that NHMP personnel were present at the site of the accident and engaged in rescue activities, monitored by DIG (Motorway) Mohammad Yusuf Malik and the sector commander, Commander Nafri.
In February, at least 14 members of a wedding party, including women and children, were killed and 64 people were injured after a bus fell into a ravine and overturned near Kallar Kahar.
The bus had hit two other cars and a truck on the opposite track. According to police, the wedding party was going back to Lahore from Islamabad when their bus had veered off the road apparently due to a tyre burst.
