Julia Hilbourne: What a wonderful result! so proud! Can we please knight @Mo_Farah, external now!   

Ewan Somerville: Mo Farah - the unbeatable, the unbreakable, the greatest. 

Anthea Simmons: Mo Farah. A privilege to watch this noble athlete  

Brendan Foster demands a knighthood for Mo Farah. What say we? 

Image source, AFP

We are seeing true sporting greatness here. No matter the opponent, the occasion, the scenario, Mo Farah has the answers.

Get him in the dugout at Arsenal and see what happens. 

Brendan Foster
Olympic medallist and BBC athletics commentator on BBC One

What a moment. What a fantastic performance. What a privilege to see this man collect a fourth Olympic medal in style. He did it the only way he knows how. 

Mo, you are a treasure, you are more than a national treasure, you are the greatest we have ever had and one of the greatest distance runners we have ever seen.

Tom Fordyce
Chief sports writer in Rio

Mo Farah is a phenomenon no-one can stop, a tactical and physical master no rivals can crack. As Bolt has owned the sprints, so Farah has ruled the distances.

Allison Curbishley
BBC athletics expert on Radio 5 live

You can try to knock him down, lead it out hard, but this man is invincible. He had the bit between his teeth. Whatever they had to test him with, he rose to the occasion. What a performance, what a race. Phenomenal.

Steve Cram
BBC athletics commentator on BBC TV

The double double! Four Olympic titles. Four Olympic gold medals. Incredible from Mo Farah. We have never seen anybody who is able to finish like that. Nobody who is able to close a race like that. Nobody who can take all on. It does not matter how quick they are, they cannot take Mo on.

USA's Paul Chelimo takes second in a PB, with Hagos Gebrhiwet in bronze.

Britain's Andrew Butchart ran a great race to take seventh, personal best too. 

Brendan Foster
Olympic medallist and BBC athletics commentator on BBC One

There goes Mo at the bell. He has company...

Mo Farah down the back straight, a look across at the pack...

Image source, Getty Images

Go! 400m to go! Mo Farah leads...

Mo Farah will become only the second man in history win both the 10,000 and 5,000m titles in the same Games twice if he wins tonight.

The 33-year-old hopes to match the performances of the great Lasse Viren of Finland, who completed the double at the Munich 1972 and Montreal 1976 Games.  

TWO LAPS LEFT. And the race is about to start. For good. For gold. 

Image source, Getty Images

Brendan Foster
Olympic medallist and BBC athletics commentator on BBC One

Mo looks relaxed. Mo looks powerful. Mo looks at his very best.

Heather: A Gold Medal for his baby Boy would be amazing for Mo!   

Mo Farah is slowing this race down, and he leads with Scotland's Andrew Butchart in second. 1,000m to go. Who has got the most left in the tank?

Image source, Getty Images

Allison Curbishley
BBC athletics expert on Radio 5 live

That was an important move from Farah to show he's feeling fine and is ready. He's going to try to slow the pace down now from the front. He's conducting this and they are letting him. Clever.

Brendan Foster
Olympic medallist and BBC athletics commentator on BBC One

Mo is letting them know he is there and he is letting them know he is stronger. He moves to the front, relaxes a little and tries to control this race.

Image source, Getty Images

Mo Farah leading from the front, looking good, looking strong. Albert Rop is right on his shoulder, it's tight and congested still. They have all lived with that pace.

FOUR LAPS LEFT.