Bajaur DPO Abdul Samad Khan told Dawn that a roadside bomb went off in the hilly area of Mamund tehsil near Pak-Afghan border.

He told Dawn News the blast occurred in Teer Banda locality when a joint team of security forces and police were conducting a search operation in the area following an earlier explosion that had targeted a vehicle of a contractor, wounding two persons.

He said four personnel — FC’s Jamshed and Mudassir and police constables Noor Rahman and Samad Khan- were martyred in the second blast.

He said it was an IED device that had been planted along the way before the first explosion. Soon after the incident, a team of FC and police reached the site and shifted the martyred security men to the district headquarters hospital in Khar for formalities.

The area was cordoned off after the blast.

No group claimed responsibility for the bombing.