Afghanistan deploys hundreds of troops to the eastern Kunar province after the Afghan Taliban killed 21 soldiers in an assault on Sunday.<br/> <br />The attack took place as U.S. and NATO forces withdraw from Afghanistan ahead of a year-end deadline, shifting the bulk of the fight against Taliban and other militants to Afghans.<br/> <br />One soldier suspects a foreign spy helped insurgents kill the soldiers.<br/> <br />(SOUNDBITE) (Dari) ARMY SOLDIER ABDUL WAHAB SAYING:<br/> <br />"This attack was a tragic one, I am so sorry for my colleagues who lost their lives, I believe 100 percent that one of their friends from their base was behind this attack, perhaps he was a Pakistani spy or whoever, otherwise it was impossible to martyr them while they were all asleep at 3 am."<br/> <br />In Kabul, funeral services are held for those killed.<br/> <br />Analysts said while Afghan security forces have made great strides, doubts remain about whether they can keep the Taliban at bay.<br/> <br />With no security pact signed by the
