As many as seven persons have been killed while six others injured when a security forces' convoy ambushed in Tehsil Bara, Khyber Agency on Monday. A private TV channel quoting sources said that the convoy was assailed near Gashtul Haj Market. As a result of which seven security personnel got killed, six others wounded and the vehicle damaged. The injured have been shifted to Peshawar while the security forces threw cordon around the areas and launched search operation.