**Seven people have been killed and more than 20 wounded in a car bomb attack in north-western Pakistan.**A senior police official in the city of Kohat said a suicide bomber had driven a vehicle into the rear wall of a police station.
He suggested the incident was a response to a military operation that is under way in the area.
On Saturday two suicide bombers killed more than 40 people and wounded at least 60 at a displaced people camp.
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