Great Britain have been disqualified from the 4x400m relay after winning their heat in 2:58.88. Still not sure why, but here's the race.

Angel: So annoying that GB's men 4x400m got disqualified after running such a good race   

We'll bring you more news on that 4x4 drama as we get it. Next, it's the women's 5,000m final though. Eilish McColgan goes for GB, Almaz Ayana goes for a world record.

Remember her smashing the 10,000m record...?

Steve Cram
BBC athletics commentator on BBC TV

We have been told it is a rule where you cannot start running outside of the zone. Martyn Rooney had one foot outside of the line. Whether the judges had decided he had started running because of that, it would be incredibly harsh. 

The interview was done before the DQ came through...

Martyn Rooney: "I want to celebrate this. I am so proud how we preformed. We had a tough draw, but the guys rose to the occasion. My last interview was terrible so I don't want to swear in this one. I think all our training is paying off."

Still not sure why GB have been disqualified - it could be that Martyn Rooney was standing in the wrong position when he took the baton for the last leg. It's very tight though. I wouldn't be surprised if this is appealed.

Michael Johnson
Four-time Olympic gold medallist athlete on BBC One

It has to have been a judge that decided he saw something somewhere that they decided was an infringement, but I just can't think what that could be.

Boos ring out as that result is announced - before cheers as it means that Brazil are through...

We are not sure why Great Britain have been disqualified yet. It has only just come through the system. More on that as we get it.

They ran so well too.

Oh dear...

Image source, Getty Images

The field looks clear for world champion Almaz Ayana to add Olympic gold to her world title - but nothing is ever won on paper.

GB have Eilish McColgan in the final - you may remember her mum...

Image source, Getty Images

It's 25 years since Liz McColgan won gold in the 10,000m in Tokyo. And the apple has not fallen far from the tree.

Holly Bradshaw at 4.70m - SEASON'S BEST! Her second  attempt at that height, a very good effort indeed.

She's in silver medal position...

Jamaica complete the relay in first place, qualifying for the final whilst Trinidad & Tobago are disqualified.

World silver medallist Dilshod Nasharov of Tajikistan led after the first attempt with a throw of 76.16m in the hammer final.

But Belarus' Ivan Tsikhan, a world champion all the way back in 2007, has gone ahead with a 77.43m attempt.

Wide open this, with Poland's dominant world champion Paweł Fajdek failing to get through qualifying.

Tom Fordyce
Chief sports writer in Rio

Unmissable determination from Martyn Rooney - an anchor leg of 43.8 secs, a word with his three team-mates afterwards, a desire to make great amends for an individual performance that was nowhere near what he wanted.

I have never understood how 400m runners seem to clock such fast times in relays! That was a belting performance though, GB won in 2:58.88. 

Steve Cram
BBC athletics commentator on BBC TV

That's better guys! Much better. That means they have put themselves in the medal zone with that run.

Martyn Rooney ran 43.8 - why can't he do that in the individual?

Martyn Rooney anchors it home with a cracking last 150m, and he is very, very animated as he crosses the line, he's saluting Delanno Williams in fact.

Has that put GB into medal contention? 

Martyn Rooney is in third place down the back street. Looks safe and sound...

Delanno Williams did a great job there, putting GB into the lead in fact! Now Matt Hudson-Smith controls it to hand over in second. Top three go through...