Hello and welcome to live coverage of the 116th edition of Paris-Roubaix - a brutal 257km slog over the cobblestones of northern France. They don't call it the Hell of the North for nothing...

Section 10 at Merignies-Avelin is the shortest, at just 700m long. Sagan drives the leaders through the crowds and dust. The world champion has no option but to continue. He'd have regretted no-one coming with him when he attacked because he only has two tired escapees to rely on, with QuickStep and EF-Drapac leading the chase behind.

Stuyven and Van Aert caught Bystrom just before the end of the cobbles. This trio is about to be caught by the six elite riders in pursuit. They trail the three leaders - including Sagan - by 40 seconds.

Terpstra, Gilbert, Vanmarcke, Phinney, Van Avermaet and Vandenbergh have a gap over the other riders in the pack after the cobbles.

Phinney and Vandenberg have been caught just as Terpstra attacks with Vanmarcke in his wheel. The race is now well and truly on.

Bystrom has a puncture so we're down to three in the lead. Sagan, Dillier and Wallays have 30 seconds on the Stuyven and Van Aert chasing group, with the pack 50 seconds back now after being disrupted by the crash.

CRASH: There's a touch of wheels in the pack and one of the Quick-Step riders swerves and causes Kristoff, Martin and Rowe to hit the deck at top speed. Their races are over - and that's terrible for all three were riding well, especially Martin.

Right, we're onto the second five-star cobbled section 11 of Mons-en-Pevele, a huge, energy-sapping 3km of jagged cobbles and tight turns.

Attack from the pack from Taylor Phinney of EF-Drapac, who takes Stijn Vandenbergh with him. Remember, they have Stuyven and Van Aert ahead in pursuit of the four leaders, who include Sagan.

Sagan combines with the three other leaders, riding alongside Dillier on the front. It's a bold move from Sagan to go so early - but he needed to try a different tactic and, to be fair, if anyone is strong enough to pull this off, it's him.

Sagan has the leading trio in his sights - and he may well ride right past them once he catches them up. They're all riding in the gutter for now, with the pack 30 seconds back. Stuyven and Van Aert are leading the chase.

There's no response as everyone hesitates, allowing Sagan to ride clear ahead of the four-star sector 12 of Auchy-lez-Orchies a Bersee section. The three leaders still have 40 seconds with John Degenkolb coming to the front as the cobbles start, with Oss in his wheel.

Now Peter Sagan is going solo - responding to some gesticulations of frustration from Van Avermaet with an acceleration of his own.

Another attack from the defending champion, throwing down the hammer just as many riders are taking on fresh bidons. Wout van Aert has it covered and it comes to nothing.

Big move from Greg van Avermaet - forcing a reply from Niki Terpstra. All the big guns are there with Sagan, Gilbert, Vanmarcke, Martin and Siberg all loitering.

Yves Lampaert is struggling a little off the back of the pack. With the leaders, it's Silvan Dillier doing all the work for the leading trio. Stybar has been caught after his foray off the front.

Right, time for sector 13 now - the 1.7km Orchies. Bora-Hansgrohe are back on the front now with Burghardt doing the work for Peter Sagan.

We haven't mentioned him yet, but Edvald Boasson Hagen (Dimension Data) is in the main pack, while Alexander Kristoff looks more settled following his early problems. They trail the leaders by 40 seconds with Stybar in between having just caught Robeet.

Daniel Oss on the attack! He did it last year for BMC and now he's doing it for Bora-Hansgrohe. Can Sagan benefit from the work which set up Van Avermaet last year? Maybe not - for now, at least - for the Italian has been chased down by Lars Bak of Lotto Soudal.

It's not Smukulis, as reported earlier, in this leading group of four. Well, make that three - because Robeet has now been dropped leaving Dillier, Bystrom and Wallays out ahead.

We're onto sector 14 at Beuvry-la-foret, which is 2.7km and rated three star. Stybar has dropped Soler and now rides solo in pursuit of the four leaders. Soler has been caught by the pack, led by Martin.

Taylor Phinney is in the mix for EF-Drapac as the main pack close in on reeling in both the Stybar group and the remnants of the early break. Daniel Oss is now riding tempo for Bora.