According to a statement issued by the ISPR, 12 others were injured, including two women.
The assault, which took place in Boya, North Waziristan, came just hours after militants disguised as security forces stormed the country's busiest airport in Karachi.
"The death toll could increase," a military official told Reuters.
No group immediately claimed responsibility for the attack but the officials said that the Tehreek-e-Taliban Pakistan (TTP) were responsible.
Last week, a suspected suicide bomber attacked a security forces vehicle in Rawalpindi, home to army headquarters, killing five people including two officers.
Sunday night's attacks on the airport in Karachi and an increasing number of assaults on military outposts in the last few weeks have all but destroyed prospects for peace talks between the TTP and the government.
In May, the armed forces launched their first major offensive in years against Taliban militants near the Afghan border after several rounds of government-led talks aimed at ending an insurgency failed.
Disagreements over how to handle the insurgency have marred relations between Prime Minister Nawaz Sharif and the army, which has been pushing for a major military offensive.
COMMENTS (3)
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Now is the time we should start clean sweep operation. And start cleaning our cities from insrugents those are in every street in every city and in every part of pakistan, Once cleared then we should do operation in their hideouts but not to allow them again to disperse as what happened always...
Atleast army needs to show its competence and respond back. Losing men and harp on warning of action is the usual statement of in incapable govts. Army needs to start taking lead.
The predictions are coming true. Since the regime changes in Indian-Afghanistan temperatures are hotting up inside Pak. It seems we are being put under pressure from both sides. The establishment needs to come up with a more nuanced policy to tackle these changes.