Security forces along with police officers conducted cordon and search operation in Dabrai, Bajaur District on Wednesday night.
According to Inter-Services Public Relations (ISPR), an Improvised Explosive Device (IED) exploded and four personnel embraced martyrdom during an operation.
These personnel included two Federal Corps (FC) soldiers identified as Lance Naik Mudassir and Sepoy Jamshed and two police Constables Abdul Samad and Noor Rehman.
Area clearance is being carried out to eliminate any terrorists found in the area, the military media wing stated.
Meanwhile, Federal Interior Minister Sheikh Rashid expressed grief over the martyrdoms of four security personnel in Bajaur. The nation is proud of the soldiers who render sacrifices for the safety of motherland, he added.
The minister further vowed to continue operation against terrorists.