MIRANSHAH, Pakistan (AFP) - At least two security personnel were killed and five others wounded on Sunday in a bomb attack on a convoy in Pakistan's northwestern tribal areas.

The attack came in the Mir Ali area of Miranshah, the main town in the North Waziristan tribal region, a hub of Taleban and Al-Qaeda linked militants on the Afghan border.

"Two security officials were killed and five others wounded in the explosion caused by a planted bomb," a security official told AFP, adding that a large military convoy was later due to pass by the area.

Militants threw the dead body of a kidnapped police official on the road in the same area earlier in the day. The official had been kidnapped from Bannu district a few days ago.

No group immediately claimed responsibility for the killings.

The umbrella Tehreek-e-Taleban Pakistan faction and Al-Qaeda-linked militants have led a bloody campaign against the Pakistani state in recent years, carrying out hundreds of attacks on security forces and government targets, concentrated largely in the northwest.