A soldier with the NATO-led force in Afghanistan shot and killed an Afghan policeman in a car that was driving toward a NATO patrol at high speed. Soldiers warned the approaching vehicle with hand signals, a mini flare and warning shots, but it continued its approach toward the convoy, NATO's International Security Assistance Force said in a statement Sunday. Troops opened fire at the car, mortally wounding a passenger who officials later discovered was an Afghan police officer. The incident happened Saturday in Lashkar Gah, the provincial capital of Helmand province. "This was an unfortunate incident but I do not blame the foreign forces," said Helmand's police chief Col. Asadullah Sherzad.