Thirty-nine NATO service members have died in a record 31 attacks this year by people wearing Afghan security uniforms, a Friday report on NATO's official online video channel said.
"Some 10 percent we know are related to the insurgency," said Brig. Gen. Gunter Katz, a spokesman for the NATO-led International Security Assistance Force.
U.S. Marine Gen. John Allen, commander of NATO troops in Afghanistan, issued an order that all troops in the country carry loaded weapons at all times because of the attacks, a U.S. official, whose name was not reported, told CNN.
Maj. Gen. James Ferron, a deputy commanding general who oversees NATO's training of Afghan forces, said the order was issued not only to put a stop to the attacks, but also the conditions that give rise to the incidents.
"Where there is an insurgency, there is going to be an attempt to infiltrate. You can't stop it. But what you can try to do is neutralize it," he said.