KALAYA, Orakzai: Pakistani troops killed seven militants in clashes after a landmine planted by insurgents on a roadside killed a soldier in the northwestern tribal region of Orakzai, security officials said.

Orakzai is one of the most lawless areas in Pakistan’s northwest tribal region, which is made up of seven districts near the Afghan border.

Pakistan launched a major operation in Orakzai in March last year after militants fled a sweeping offensive in the nearby tribal district of South Waziristan.

Late last year military officials said lower Orakzai had been cleared, but the militant threat persisted in some pockets of the upper part of the area.

Around 4,000 people have been killed in militant attacks in Pakistan since July 2007.