At least four suspected militants were killed and another injured on Friday when a bomb exploded in their vehicle in Pakistan's Khyber tribal region.
The blast occurred in the mountainous Tirah valley near the border with Afghanistan. The vehicle was destroyed by the blast, officials told the media.
It was not clear whether the bomb was planted in the vehicle or the militants were carrying the explosive device.
Supporters of the Lashkar-e-Islam militant group and its rival faction Ansar-ul-Islam routinely target each other mainly because of +
Hundreds of members of both groups have been killed in the bloody conflict over the past few years.
Security forces have conducted several operations against Lashkar-e-Islam and its chief Mangal Bagh has gone into hiding. The group is accused of having links with the Pakistani Taliban.
Khyber Agency is the main supply route used by NATO trucks and tankers ferrying supplies and fuel to foreign troops in Afghanistan. Militants routinely target these vehicles in the tribal region.
In a separate development, two security personnel sustained minor injuries when a roadside bomb hit a vehicle in southwestern Balochistan province this morning.
No group has claimed responsibility for the attack yet.