operations began. as it stands now, the evacuation effort is set to end in eight days. president biden said on sunday the u.s. may extend the august 31st deadline, but the taliban warned just hours later, there will be no extension. let s go to nick paton walsh in qatar today. what can you tell us about the security right now at the airport in kabul? reporter: i mean, it s always been volatile. and when i was there last week, you could hear gunfire on the edges of the airport. there was the worst situation when a sniper shot one of the afghan security people who works on the base helping the americans there. that caused his colleagues, other afghans, to essentially fire back in the direction they thought the shot came from. i understand, actually, they ended up shooting toward u.s. marines that returned fire. they say in the exchange of gunfire, four afghans were, in fact, injured. i understand they are in a stable condition. today we have heard some