NATO official 's order was made in recent days as concern mounted over the attacks . Taliban leader Mullah Mohammed Omar has purportedly released a statement . The attack on Bagram Air Base came after U.S. forces killed two senior al Qaeda leaders at an undisclosed location last week and captured or killed several other top militants who were plotting to launch more attacks. Allen said . `` Green-on-blue '' attacks have been carried out by Afghans in security uniforms .
NATO official 's order was made in recent days as concern mounted over the attacks . Taliban leader Mullah Mohammed Omar has purportedly released a statement . The attack on Bagram Air Base came after U.S. forces killed two senior al Qaeda leaders at an undisclosed location last week and captured or killed several other top militants who were plotting to launch more attacks. `` Green-on-blue '' attacks have been carried out by Afghans in security uniforms .