The attack in the Khyber Agency, which is also the major supply route for US-led foreign forces in Afghanistan, came a day after a teenage suicide bomber killed at least 51 people offering Friday prayers at a mosque in the region.
Meanwhile, an army operation called Operation Koh-e-Sufaid meant to flush out the militants from Khyber Agency ended on Thursday. According to the military, the operation was launched to clear the area of militants whose fighting had increased the incidence of sectarian killings, kidnapping, and extortion in the agency.
It was army's first major military operation since the May 2 killing of Osama bin Laden by US Seals in Abbottabad.
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