Screening of Afghan forces

The alliance said step will prevent insurgents from infiltrating the army after a spate of killings of foreign troops by Afghan colleagues. An updated counter-infiltration plan designed by military commanders was adopted by NATO ambassadors Tuesday on a request from France in the wake of the killing by a recruit of four French troops in January. Nearly one in five NATO soldiers killed this year has died at the hands of their supposed allies -- six of them Americans who were killed by Afghan colleagues after the burning of holy Qrans at a US base.