PESHAWAR: Pakistan security forces suffered heavy causalities on Monday night when 14 of their soldiers were killed during a militants' ambush in the Khyber Agency, DawnNews reported.

Official sources said that the militants attacked security forces in the area of Akakhel and 14 soldiers, including a captain and colonel, died when a mortar shell landed near them.

Security forces had been conducting an operation in the area for the past several days and had arrested a number of rebels, sources added.