Not for the first time this season, Kevin Magnussen is under investigation for an incident on the first lap when he clashed with Force India's Nico Hulkenberg.

Meanwhile, Lewis Hamilton pits from the lead. It's a good stop from Mercedes and he rejoins in third.

Lewis Hamilton is told that it's almost time for his pit stop, they are just waiting for the window to clear. That will probably be Valtteri Bottas, who is 18 seconds behind and yet to stop. They'll want to come out ahead of him.

Valtteri Bottas is back up to fourth, after several cars in front of him pitted. However, he is 10.7 seconds behind Williams team-mate Felipe Massa, which shows how much that poor start cost him. Bottas is told that those who pitted are stuck in traffic, which is good news for their strategy.

Former Germany international football Didi Hamann:, external Come on Nico Rosberg.

Rhys: Wife's waters have broken! I only got to see the start and we're off to hospital! Go on Lewis!! I'll be back as soon as I can.....

Allan McNish
BBC Radio 5 live analyst

"Lap seven of 55 is very early for a pit stop. It could be two or it could be three pit stops."

The Mercedes are in a league of their own at the moment, lapping around two seconds quicker than anyone else apart from Felipe Massa's Williams. Lewis Hamilton leads Nico Rosberg by 1.7 seconds.

Fernando Alonso is in early, ditching the super-soft tyres for the softs. Meanwhile, Jenson Button is told to box at the end of the lap, too. He's currently fourth in the McLaren.

Fernando Alonso passes Kimi Raikkonen with a brilliant move around the outside for fifth. Daniil Kvyat sniffs a chance and steals sixth. Raikkonen down to seventh in the space of two corners. Meanwhile, Daniel Ricciardo passes Adrian Sutil and Kamui Kobayashi in one move for 15th.

Mercedes:, external Lewis Hamilton clear of the DRS range now - Nico Rosberg starting to settle into his rhythm. There's a long way to go yet...

Ben Edwards
BBC F1 commentator

"I'm sure Hamilton will try to win this race as slowly as possible - he wants the reliability."

Lewis Hamilton extends his advantage to 1.7 seconds of Nico Rosberg, with Felipe Massa 3.1 seconds adrift.

Paul:, external The whole season summed up in one corner. Rosberg is quick but Hamilton is the better racer. Game on.

Emily Russell:, external Superb start from Lewis Hamilton. I do want him to win the title but primarily today I'm cheering on the Williams boys. Come on!

David McMillan:, external Great start from Lewis. It is now officially squeaky bum time.

David Coulthard
BBC F1 co-commentator

"I wouldn't be surprised if there was a 'yee-ha' inside Lewis' crash helmet."

James Allen
BBC Radio 5 live commentator

"That is a dream start for Lewis Hamilton. The situation is exactly as he would have wanted."

Romain Grosjean heads into the pits to take his drive-through penalty, which is a carry over from his engine change. The Frenchman rejoins in 20th.

Meanwhile, Daniel Ricciardo and Sebastian Vettel, who started from the pit-lane, have made little progress. They're only 17th and 18th respectively.

And now Lewis Hamilton leads by 1.6 seconds from Nico Rosberg with 52 laps to go.

Match of the Day presenter Gary Lineker:, external "When you have to do it, the very best MAKE it happen. Sensational start from Lewis Hamilton."

Allan McNish
BBC Radio 5 live analyst

"Right now Hamilton's got control of the race. Now he can control what Rosberg does rather than the other way around. Now Rosberg must pass Hamilton if he's got any chance of being world champion."

A fan in one of the grandstands punches the air as Lewis Hamilton flies past in the lead. The Briton extends his advantage over Nico Rosberg to 1.4 seconds, with Felipe Massa 2.1 seconds adrift.

Jenson Button, whose could well be contending his final race, made a blistering start to rise up two places to fourth, he's ahead of Kimi Raikkonen and Fernando Alondo with Valtteri Bottas down to seventh.

Lewis Hamilton leads Nico Rosberg by 1.2 seconds after just one lap.