PESHAWAR: At least four security men were killed in an explosion targeting a convoy of security forces in Warmagai area of Kurram tribal region on Tuesday.

Following the blast, security forces and militants also clashed in Warmagai area. The clash left a key TTP commander Gul along with his accomplice dead.

The search operation is still ongoing.

Security and rescue teams reached the blast site and shifted the victims to a nearby hospital. The security forces' vehicle was destroyed in the blast.

The blast site was cordoned off by security forces as a probe into the incident went under way.

Kurram is one of the most sensitive tribal areas as it borders three Afghan provinces and at one point was one of the key routes for militant movement across the border.

The region was claimed by the military to have been cleared of insurgents during an operation a couple of years ago, however, militants still carry out sectarian attacks and also target security forces occasionally.

Kurram tribal agency is adjacent to North Waziristan region where the operation Zarb-i-Azb is in progress against Taliban and other insurgent groups.

Pakistan Army's announced the grand operation named 'Zarb-i-Azb' against Taliban militants in the stronghold following a Tehreek-i-Taliban Pakisitan-claimed attack on Karachi airport and failure of peace talks between government and Taliban negotiators.

The development also comes amid Operation Khyber I which was launched in Khyber tribal agency on credible information about the presence of militants in parts of Sipah and Akkakhel areas, according to Shahab Ali Shah.