Postpublished at 15:28 British Summer Time 9 July 2014
Yellow jersey holder Vincenzo Nibali has collided with a team-mate who was already on the floor. He doesn't lose much time, untangling himself before getting back on his way.
Dutchman Lars Boom wins dramatic fifth stage
Defending champion Chris Froome out of the Tour
Briton Froome hurt after second crash on day five & third of race
Italian Vincenzo Nibali retains yellow jersey; Team Sky's Richie Porte 8th overall
Seven sections across cobbles after two removed because of bad weather
Lawrence Barretto
Yellow jersey holder Vincenzo Nibali has collided with a team-mate who was already on the floor. He doesn't lose much time, untangling himself before getting back on his way.
Rob Hayles
Former Great Britain cyclist on BBC Radio 5 live sports extra
"It's been absolutely bucketing down from the start of today. What a spectacle we are seeing. The riders are dropping like flies.
"On the cobbles, you have to try to relax, you almost have to steer with your hips and gingerly caress the bike around. It's so difficult."
Paris-Roubaix specialists Lars Boom and Sep Vanmarcke have made a break for it, leaving the peloton behind and giving chase in a bid to catch the breakaway.
Jurgen Van den Broeck and Andrew Talansky have both hit the deck as the crash-count continues to rise.
Amid all the action, I forgot to say that Lieuwe Westra of the Astana team won the intermediate sprint ahead of Simon Clarke.
Two-time Tour de France winner Alberto Contador has been dropped by the peloton - which features Vincenzo Nibali - during the second cobbled stage. The Spaniard is about 40 seconds down.
With Team Sky's leader Chris Froome out, they will have to put their focus either on Richie Porte, who is two seconds off the pace overall, or Geraint Thomas, who trails yellow jersey holder Vincenzo Nibali by 16 seconds.
BBC Radio 5 live sports extra
The BBC Radio 5 live sports extra team are up and running with online-only commentary. You can listen to Rob Hayles and Rob Hatch via the link at the top of the page.
It's like the Tour de France has gone off-road. The conditions are appalling, the riders covered in mud as they splash through puddles or slip into the grass verges.
The rain has eased off but the roads are still soaking. Team Sky's Geraint Thomas has moved to the front of the peloton, which is 90 seconds behind the breakaway with 51km to go.
Tom Miszkowski:, external Gutted for Froome, flash back to 3 glorious days in England, only for it all to come crashing down on the soggy streets of France.
Nick Byfield, external #teamsky Wow this is why you always have a plan B-radley. Wiggo would have grabbed it by the horns. Geraint Thomas time to shine.
CletusDover:, external Bet Bradley Wiggins is annoyed. Perhaps substitutes should be allowed?
Chris Froome is in deep conversation with a team member in the back of the Team Sky car. We'll hear from him later today.
The first cobbled section is done and dusted, but the peloton has split, with Alberto Contador, Vincenzo Nibali and Peter Sagan in the first part. The breakaway leads by one minute and 46 seconds.
Team Sky rider Ben Swift on Twitter:, external Absolutely gutted for Froomey and the whole team. Can't believe it.
It's just not worked out for Chris Froome this year, the Briton crashing three times in two stages.
He's made of tough stuff so for him to throw in the towel, he must be in serious pain.
Who will take over as Team Sky's leader now? Did Team Sky make a mistake dropping Sir Bradley Wiggins?
Chris Froome has climbed into the Team Sky car to end his participation in this year's Tour de France.
Britain's Chris Froome does not look like he is in any rush to get back on the bike. He's holding his arm and limping. Is it all over?
Rob Hatch
Former Great Britain cyclist on BBC Radio 5 live
"It's absolute chaos at the moment and everybody is looking to see how the main contenders will cope with terrain they are not used to. It's carnage on stage five."
Chris Froome is down yet again. This horrible luck for the defending champion.
French champion Arnaud Demare is down again and is now all alone, two minutes and 20 second behind the peloton. Meanwhile, Swiss rider Fabian Cancellara has just hit the deck, too, as the peloton negotiated a roundabout.