The death toll from an overnight deadly militant attack on a police post in northwestern Pakistan rose to 11 early Thursday.

Axar.az reports, citing ABC News, that the security forces killed 15 militants in an hourlong gunbattle after they targeted the Khazina police post in Hangu district in Khyber Pakhtunkhwa province, which borders Afghanistan, police official Irfan Khan said.

No group immediately claimed responsibility for the assault. Suspicion is likely to fall on the Pakistani Taliban, known as Tehrik-e-Taliban Pakistan, or TTP, which has stepped up attacks on Pakistani security forces in the region in recent months.

Among those killed was Diyar Khan, a senior police officer who led reinforcements to the scene, according to a provincial police statement. More than two dozen police officers were also wounded in the attack.