Final day of World Athletics Championships in Doha
GB women awarded 4x400m bronze after Jamaica disqualified
Men's 4x400m - GB fumble baton as US win gold
Men's javelin - Grenada's Anderson Peters takes gold
100m hurdles final - American Nia Ali wins gold
Women's long jump - Malaika Mihambo wins; GB's Abigail Irozuru seventh & Shara Proctor 11th
Men's 10,000m final - Uganda's Joshua Cheptegei wins gold
Kenya's Timothy Cheruiyot wins 1500m title
Use play icon to watch live coverage from Doha (UK only)
Men's 4x400m relay
Never in any doubt!
The United States romp home to yet another gold medal in 2:56.69.
Jamaica are second in 2:57.90 and Belgium pick up a terrific bronze in 2:58.78.
Men's 4x400m relay final
Andrew Cotter
BBC Sport commentator in Doha
Rabah Yousif could not get the baton!
Oh, Toby Harries is absolutely gutted.
He just fumbled trying to pass Rabah Yousif the baton. Yousif was reaching desperately for it and couldn't cling on, with Harries falling to the floor in despair.
Men's 4x400m relay final
OH!
Great Britain are OUT!
Men's 4x400m relay final
It's the United States leading, with Jamaica a close second, the rest huddled behind...
Men's 4x400m relay final
Ready?
Set...
GO!
Men's 4x400m relay final
It does feel a bit like we're in a nightclub and they're playing one last song before the lights come on and it's time to go home.
Men's 4x400m relay final
Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV in Doha
This Great Britain team is very young. If they can beat anyone, that's a win for them.
Men's 4x400m relay final
A reminder that there's no Martyn Rooney on the anchor leg for the Brits tonight. Toby Harries replaces Rooney in the line-up.
This is a tough ask - the United States, Jamaica and Trinidad and Tobago all looked strong, as did Belgium.
GB reached the final after Botswana were disqualified, freeing up the last lucky loser spot.
Men's 4x400m relay final
Right then.
The last event of the competition is upon us.
Can GB take one final medal on that flight back home?
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Women's 4x400m relay final
BBC Sport
GB's women's 4x400m relay team have been speaking to BBC TV after finishing fourth in the final.
Zoey Clark: "This was difficult, we really upped our game and the time we ran shows that."
Jodie Williams:"My legs are burning! I'm so proud of these girls. Every single one of them showed up and did their part. I couldn't be happier to be part of this team. We'll see about the individual 400m. Let me go on the off season first!"
Emily Diamond: "We ran our socks off today, every single one of us. We wanted that medal so, so badly.
"That's the fastest we've run in many years, it surpasses the Olympics, and I think we can be proud of ourselves."
Laviai Nielsen: "There was a lot of starting and stopping on my leg. I thought I should just try and run a smart leg. I probably got it tactically wrong which is my fault completely, so I'm really sorry to the girls. I think it's quicker than we've run in quite a long time so that bodes well for Tokyo next year."
Women's 4x400m relay final
Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV in Doha
Poland were just too good. They were always going to be too good.
That was a fantastic race by the US and it was a really smart choice to bring in the two 400m hurdles runners.
Women's 4x400m relay final
Colin Jackson
Two-time world 110m hurdles champion on BBC TV in Doha
Poland ran a national record - they were on top, top form. Scintillating.
The US team was strong - medals galore, champions galore, and experience.
Women's 4x400m relay final
GB were 0.65 secs off a bronze medal and set a new season's best time.
Women's 4x400m relay final
Andrew Cotter
BBC Sport commentator in Doha
Great Britain got it right but they're not quite at the level of Jamaica and Poland.
Women's 4x400m relay final
The Americans dominated that from the moment the starter's gun sounded. They win gold in a world leading time of 3:18.92.
Silver goes to Poland, bronze for Jamaica.
Unfortunately, it's fourth for GB. Laviai Nielsen ultimately couldn't make up the ground on Poland and Jamaica.
Women's 4x400m relay final
Laviai Nielsen needs to seriously push on on this leg. GB in fourth with 200m to go.
Women's 4x400m relay final
The gold medal is pretty much the USA's now and it's a three-way battle for the other medals.
Jamaica are closing down GB in the bronze medal position as the fourth exchange approaches.
Women's 4x400m relay final
At the start of the third leg, it's USA in first, Poland in second and GB in third.
Emily Diamond has the baton for GB now.
Women's 4x400m relay final
Zoey Clark gives Great Britain a good start but it's the USA who make big strides in these early stages.
A good changeover for GB but the USA are miles ahead. Poland and Jamaica also in the mix.