Officials said suspected militants attacked the post near Miranshah, capital of the North Waziristan tribal region, early this morning.
The assault is reported to have continued for a number of hours. No casualties among the attackers were immediately reported.
The attack came days after eight Pakistani troops were reported killed on 7 January in an assault on another post in the region.
Pakistan has deployed thousands of forces in an effort to stop Taliban and Al-Qaeda militants and their local allies from operating along the mountainous Pakistan-Afghan border region.
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