A roadside bomb that blew up a Pakistani police vehicle killed three people today.
The attack in the Bannu district in the North West Frontier Province injured two others, police said.
Militants regularly attack members of the security forces in Pakistan, especially in the northwest, near the border with Afghanistan.
A missile, believed to have been fired by a US pilotless drone, struck a house in North Waziristan yesterday, killing 13 suspected militants.
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The army's top medical officer was killed in a suicide bomb attack in the city of Rawalpindi on Monday.