What a race so far. We have had the Ferraris crashing into each other, a spectacular puncture for Carlos Sainz and Kimi Raikkonen's car briefly on fire.

Image source, F1

Image source, F1

Image source, F1

So, that red flag is to allow the tyre barrier to be repaired at Eau Rouge after Magnussen's crash.

The cars are lined up in the pit-lane, awaiting further instructions.

Red flagpublished at 13:25 British Summer Time 28 August 2016

13:25 BST 28 August 2016

Lap 10/44

The race has been red flagged. The cars come into the pits.

Image source, Getty Images

Things have worked out very well for Hulkenberg, who has squeezed in a pit stop and is still up in third.

Rosberg leads, with Ricciardo behind.

Image source, Getty Images

Amid all that, Alonso climbed to fourth and Hamilton to fifth and they sit there safely in the parade behind the safety car.

Jenson Button's race is over already. He tells BBC Radio 5 live: "I got hit from behind at Turn Six. It launched the car into the air, did a lot of damage and it was game over."

The safety car is still out while the tyre wall is repaired.

I tell you what, Magnussen hit the last stretch of that tyre wall before it turns into metal barrier. I daren't think what might have happened.

Allan McNish
BBC Radio 5 live Formula 1 analyst

Kevin Magnussen is out of the car and is hobbling a bit. That was a monster, monster accident. The car is completely destroyed and mounted on the wall.

It was an odd place to have the accident. He came over the top of the hill, he over-steered one way, then it caught and flicked him into the wall.

He is very fortunate to get out of that OK as that is 180 miles per hour crash.

Marc Sepetowski: Crikey. What a start to this grand Prix! Most action packed start I can remember in a long time. All perfect for Rosberg this.

Emma Swift: Crash, fire and blown tyre all within the first few minutes! Who says #F1, external is boring??

There doesn't seem to be a definitive reason for Magnussen's crash. He loses it coming out of the top of the hill in Eau Rouge and zig-zags his way into the tyre wall on the right.

The head rest flies out - which is a massive worry. And bits of car explode into the air, like a plume of feathers.

That brings out the safety car.

Magnussen is, thankfully, walking away, albeit with a bit of a limp.

Image source, Getty Images

Kevin Magnussen has ploughed into the tyre wall at Eau Rouge. An explosion of debris.

We have an answer to why Button is out. Wehrlein went into the back of him from the start. Both cars are out of the race.

Ericsson and Sainz look to be gone too.

Image source, EPA

So - top five:

Rosberg, Hulkenberg, Ricciardo, Bottas, Perez.

We're racing again and the virtual safety car has gone.

Jenson Button's race is over - his McLaren has given up a lap into the race.

Allan McNish
BBC Radio 5 live Formula 1 analyst

Raikkonen had a very good launch off the line, then he had to defend a bit. He was the totally innocent party in this. He had Verstappen diving in to get position.

At the first turn Verstappen had no room to go past Raikkonen down the inside. Raikkonen is squeezed between Vettel on his outside and Verstappen on his inside and ends up touching both of them.

Image source, Getty Images

Edward Taylor: Lewis already ahead of Verstappen, Raikkonen and Vettel. He won't need to get past them later. Podium definitely possible.

Stephen Lind: Comical start continues. RAI car on fire, SAI tyre falls off. Best race of the year already.

Don Uorri: HAM has to get a podium now after that start, anything less would be failure.