Sources privy to the Customs authorities state that Amir was driving the vehicle while constable Shakeel, Ijaz and Jameel were onboard the four-wheel drive.
Meanwhile, hunt is underway with the help of Motorway Police to catch the smugglers, Director General of Pakistan Customs, Imtiaz Ahmed said.
Pakistan Customs successful operations against movement of contra band goods have been reported numerous times in the recent past.
On July 30, officials at Benazir International Airport had seized Rs 10 million worth of ‘ice’, a kind of heroin.
Azizur Rehman who was to board flight SV-723 of a private airline that was bound for Riyadh from Benazir International Airport was stopped for checking over suspicion.
On July 23, four criminals were nabbed at Islamabad airport for attempting to smuggle 1,500 mobile phones abroad. All the four culprits reached Islamabad from Dubai.
In June, Customs authorities foiled an attempt to smuggle heroin and 29 bullets after apprehended two criminals in two different incidents at Benazir Bhutto International Airport.
About two kilograms of heroin was seized from possession of a resident of Khushab who was scheduled to travel to Saudi Arabia via QR-633 flight.