Four off-duty paramilitary soilders were kidnapped as they headed home in Razmak, south of the region’s main town Miranshah.
The fate of the fourth trooper is not known.
Separately, the Pakistani army said it has killed five pro-Taliban members after a military convoy was hit by a roadside bomb in the same region.
In another incident, two military personnel were wounded after a bomb blast hit a convoy of the security forces in the same area, officials said.
North and south Waziristan, near the Afghan border, are seen as hotbeds of support for al-Qaeda and Taliban fighters.