PESHAWAR (AFP) - One woman was killed and 15 people wounded Wednesday when a suicide bomber crashed his explosives-packed car into a barrier outside a police station in troubled northwest Pakistan, police said.

The attack came in early in the morning in Bannu district of Khyber Pakhtunkhwa province, which is rife with Taliban and Al-Qaeda-led militancy.

"We have confirmation of the death of one woman in the suicide attack near Domail police station in Bannu. More than 15 people have been wounded including six policemen and two kids," local police chief Abdul Ghafoor Afridi told AFP.

Afridi said seven houses and part of the police station also collapsed due to the impact of the blast.

Another police official said the suicide bomber attacked from behind the building as authorities had deployed heavy security measures around the police station.

"He hit a barrier installed at a distance from the police station. The woman killed in the attack was a civilian," said Azmat Ali Khan, a senior police official.

A bomb disposal squad official said more than 500 kilograms of explosives were used in the attack.

"The vehicle used for the attack was completely destroyed after the blast," said Kismat Khan, the bomb squad official.