The suicide bomber rammed an explosives-laden vehicle into Esha check post near Miranshah, the main town of North Waziristan Agency, last night.
Intelligence officials say the vehicle exploded next to two tankers that were supplying fuel to troops in the North Waziristan tribal area. The blast set the tankers on fire and destroyed two residential army barracks.
In the meantime a military spokesman said, six security personnel were killed instantly and 11 more died later. Over a dozen security personnel were also injured following the blast.
No group claimed responsibility for the suicide attack. North Waziristan is the main sanctuary for Taliban and al-Qaida militants in Pakistan.