Three persons, including an Indian Tibetan Border Police (ITBP) constable, died while four others were injured when a Tata Magic MUV (multi-utility vehicle) collided with a stationary truck near Lalru in the wee hours of Monday.
All victims were travelling from Dera Bassi to Ambala and the accident took place on the Chandigarh-Delhi highway near Dehar village.
All victims were rushed to the Dera Bassi civil hospital, where doctors declared three persons brought dead.
The deceased have been identified as Deepak Kumar, an ITBP constable posted at ITBP Ramgarh unit in Panchkula; Kush Kumar and Sant Lal Vishkarma, residents of Dera Bassi.
Dera Bassi residents Harjit Singh and Morsalim and her two daughters Anju, 11, and Jaya, 12, sustained severe injuries during the accident.
Police sources said a portion of the Tata Magic vehicle was damaged and constable Deepak Kumar, who was trapped inside the car, was rescued by breaking open the door.
The injured are under treatment.
Investigation revealed that the accident had taken place due to the negligence of drivers of both vehicles.
The speeding Tata Magic had rammed into the truck stationed on the road side, as the parking lights of the truck were not on.
Following a complaint filed by Harjit, a case was registered against the drivers under sections 279 (rash driving or riding on a public way), 337 (causing hurt by an act endangering life or personal safety of others), 283 (danger or obstruction in public way or line of navigation) and 304A (death due to negligence) of the Indian Penal Code.
However, the police are yet to identify the drivers as they managed to flee.
The police said the vehicle in which the victims were travelling had been taken into the custody, whereas the truck driver fled with his vehicle.
Dera Bassi superintendent of police Anil Kumar said a case had been registered and investigations were on.