Four Pakistani police officials have been killed and six others injured after gunmen attacked vehicles carrying oil for NATO forces in Afghanistan, Press TV reported.
The attack took place near a roadside restaurant near Attock, some 60 kilometers from the capital Islamabad, on Sunday.
"The gunmen first opened fire on the tankers and after fleeing they attacked a nearby police post in which three police constables and one sub inspector were killed," AFP quoted local police official Sajid Mehmood as saying.
Nobody has claimed responsibility for the incident, but pro-Taliban militants have repeatedly attacked NATO vehicles carrying supplies and oil to nearly 150,000 US-led foreign soldiers in Afghanistan.
Pakistan is the only route through which supplies can be sent to NATO troops in landlocked Afghanistan. Other routes, largely through Russia and the Central Asian states, have proved too costly, both politically and economically.