The explosion took place near a security check-post in Hangu on Thursday. – (File Photo)

HANGU: A suicide bomber set off explosives in a vehicle at a security checkpoint in the northwest Pakistani town of Hangu on Thursday, killing at least nine people, officials said.

Pakistan has seen a wave of suicide attacks in the past three years, many in northwestern regions along the Afghan border where the Pakistan military is battling Taliban insurgents.

“Four policemen are among the dead ... it also killed five people in cars driving past,” police official Gul Jamal told Reuters.

Seven women and four children were among 30 wounded.

The bomber used about 600 kg of explosives. The blast destroyed three vehicles and severely damaged seven houses, a bomb disposal official said.