Mahmood Alam, a police officer in the town of Thal, said a bomber rammed an explosive-laden car into a checkpoint in Northwest Frontier Province, killing the paramilitary soldiers.
Pakistan's northwestern tribal regions near the Afghan border have seen frequent terrorist attacks, and are believed to host militants linked to Al-Qaeda and the Taliban.
On August 19, Pakistani helicopters bombed suspected militant hideouts in the North Waziristan region, killing at least 15 militants and four civilians.
Chief military spokesman Major General Waheed Arshad said most of the slain militants were foreign fighters, mainly from Uzbekistan.
(Reuters, AP)