KOHAT, April 18 A suicide bomber rammed his explosives-laden vehicle into the boundary wall of a police station in Kohat, killing seven civilians, including an infant, on Sunday.

Nine security officials -- two personnel of the Frontier Constabulary and seven policemen -- were among 31 people injured in the attack. Three women passers-by also suffered injuries.

All the injured were taken to the KDA Divisional Headquarters Hospital and Women and Children Hospital.

Tehrik-i-Taliban Pakistan (Waziristan) spokesman Qari Hussain claimed responsibility for the attack in a telephonic message. He said the vehicle had accidentally exploded near the Bilitang police station, adding that the actual target were security forces in the Kohat Cantonment.

Abdullah Khan, Deputy inspector of Police, Kohat region, told newsmen that the vehicle used in the attack carried 250kg of explosives.

The vehicle hit a tractor parked near the wall of the police station. The blast flattened the building of the police station and a nearby school and also damaged four vehicles.