A Pakistan Army Captain and two soldiers were killed whereas two others were injured in an improvised explosive device (IED) attack in Upper Orakzai tribal region, officials confirmed.
Two other Army personnel were also injured in the attack, officials further said.
Security forces launched a search operation in the area after the incident.
According to officials most of the region is now under the control of administration and the last pockets of resistance, in Upper Orakzai tribal region along the border of Tirah Valley of Khyber region and the adjoining Kurram Agency, are being cleared of militants.
Meanwhile At least 15 militants have been killed in a skirmish with security forces in Manatoo area in Kurram Agency.