hello, this is bbc news with joanna gosling. the headlines... twenty years after being sent in, the last british troops have left afghanistan, the evacuation in the wake of the taliban taking charge is over. the effort has been frankly truly humbling to see the hours worked, you know, the exhaustion painted on people's faces. so we tried our best. president biden warns another attack on kabul airport is highly likely within the next 24—hours — as us forces prepare to leave. forecasters warn a storm approaching louisiana could be more powerful than hurricane katrina, which devastated new orleans 16 years ago. dilemma for doctors — a severe shortage of test tubes in the uk means patients needing urgent blood tests could face delays. at the paralympics — great britain's hannah cockroft wins her third successive 100m gold. now on bbc news, on the travel show there's another chance to see the second part of rajan datar�*s epic railjourney across the united states. i'm on a coast—to—coast trek across the south of the usa, exploring the p