Three policemen were killed and six wounded when their vehicle hit a roadside bomb in Pakistan's volatile city of Peshawar early on Friday.
Police say the bomb was remoted-controlled.
Peshawar, the capital of the North West Frontier Province bordering Afghanistan, has borne the brunt of attacks by Taliban militants in recent weeks in retaliation for a military offensive in their South Waziristan bastion.
The attack on a police patrol, shortly after midnight, came hours after a suicide bomber blew himself up outside a court building in the city, killing at least 18 people.
Eight suicide bomb attacks in Pakistan this month alone, six of them in Peshawar, have killed 110 people.