NEW : All of the injured troops are Americans , an ISAF official says . At least two Afghan civilians are killed in the attack . Gen. John R. Allen : " Coalition and Afghan troops have been fighting the tenacious Taliban militants in the Afghan-Pakistani region . We have no information that indicates any kind of insurgent activity was involved or a threat to coalition forces at this time. `` Their only ability to influence the battlefield '' is often to go for a high-profile attack , he says .
NEW : All of the injured troops are Americans , an ISAF official says . At least two Afghan civilians are killed in the attack . Gen. John R. Allen : " We have no information that indicates any kind of insurgent activity was involved or a threat to coalition forces at this time. `` Their only ability to influence the battlefield '' is often to go for a high-profile attack , he says .