A major and a havaldar were injured when a mortar shell fired from across the Afghan border hit their checkpost in Baizai tehsil of Mohmand tribal region on Saturday.
Sources said that at least nine shells were fired on the Ziarat checkpost at around 4.30pm.
An official identified the injured as Major Farrukh and Havaldar Imran Khan and said they had been taken to Peshawar by a helicopter.
The Pakistan Army targeted suspected locations with mortars, the sources said.
The incident follows the death of a security man in an IED (improvised explosive device) blast in Mohmand tribal region on Friday.
Political authorities accompanied by security forces and elders demolished 12 houses and 10 shops of suspected militants and their facilitators in Dawezai area of Pandiali tehsil on Saturday.
