>> reporter: at kabul international airport, the end of the month is coming too quickly. the u.s. is trying to hit its self-imposed august 31st deadline. >> there are discussions going on among us in the military about extending, our hope is we will not have to extend. but there are going to be discussions, i suspect, on how far along we are in the process. >> reporter: taliban warning there will be consequences if it takes any longer. tension in and around the airport is still running very high, someone opened fire on afghan security forces sunday killing one and wounding several civilians. u.s. and afghan troops returned fire. the fire fight underscoring the security situation as the u.s. tries to maximize the number of people it can fly out. the military flew more than 10,000 people out of kabul in 24 hours, and another 5,000 on charters and other flights. a pace that must continue. in order to speed up evacuations, the pentagon activating the civil reserve air