we ve seen the stand-off between afghan and u.s. marines and the crowds down below. the traffic is often blocked around there and i ve seen video and heard reports that the taliban have been involved in using their presence as a sort of crowd filtration, vetting who is allowed to approach the gates and even more involve further away from the airport, further down the airport road. so it is unclear where this blast has occurred. it is certainly i think the worst news for anybody observing the situation closely. but it is sadly will most likely have fed into an area that is quite heavily populated. we ve seen images of thousands, it seems, of afghans despite the news the gates are fully closed. there is at this point no way on unless you are essentially escorted or entry on to the airport is arranged by prior coordination by the taliban and the united states and even people who have half of that circulating around the base in buses this morning. people have still gone to the gates in lar
0 casualties are unclear at this time. we will provide additional details when we can. we also learned moments ago that president biden has been briefed on that explosion outside of kabul airport. a white house official tells cnn. and we are waiting on a pentagon press briefing which will happen in about 30 minutes from now. the back ground on this, as you look at a live picture from the kabul airport, that in recent days and yesterday we reported the u.s. has been very concerned about a credible threat stream about potential terror attacks targeting the gates to the airport and the crowds around those gates. the u.s. believing that terror groups had both the capability and the planning to carry out such attacks. there is still no attribution for these attacks or as we said, any confirmation about casualties. we have our reporters covering the story. let s begin with nick paton walsh in doha. we see now a confirmed attack. only the families of the u.s. serve men concerned about who