Lewis Hamilton dominantly won his first grand prix in a dramatic Canadian grand prix at Montreal's Circuit Gilles Villeneuve on Sunday, but the biggest relief of the day is that Robert Kubica survived a sickening crash.

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BMW-Sauber's Kubica was clearly knocked unconscious when his car slammed into a concrete wall at full speed after a dice with Jarno Trulli.

The destroyed single seater then rolled several teams before coming to a rest on its side at the chicane, and he was attended to by doctors for several minutes before being taken to the medical centre with no word about his condition.

A team spokesman later confirmed that Kubica is "stable", while his manager reported that Robert was moving his arms and legs without problem.

He has been taken to hospital for further checks.

On track, the 2007 Canadian grand prix was hectic and incident-packed, with the safety car required multiple times.

Felipe Massa and Giancarlo Fisichella were disqualified for speeding through red lights at the end of the pitlane, while world champion Fernando Alonso - driving a scruffy race in the sister McLaren - had to serve a stop-go penalty for pitting when the pit lane was closed.

The Spaniard finished just seventh, allowing Hamilton to take the lead in the drivers' championship by eight points.

Kubica has broken leg

Robert Kubica broke his leg in an horror crash in Montreal on Sunday.

The BMW-Sauber driver was transported from the medical centre to the nearby L'Hopital du Sacre-Coeur de Montreal, where it was confirmed after an x-ray that a bone is broken.

Kubica 'in pain' after 280kph crash

Poland's Robert Kubica left the Circuit Gilles Villeneuve aboard a medical helicopter on Sunday complaining of pain 'all over his body', according to sources in Montreal.

Reports that he broke his leg in the horror shunt are believed to have been based on an in-car radio transmission from race winner Lewis Hamilton's engineer, but the news was not confirmed by the circuit Medical Centre.

Medical Centre officials did however confirm that Kubica emerged from the 280kph smash with 'no internal injuries', and he was due to have x-rays and other checks at the L'Hopital du Sacre-Coeur in downtown Montreal.

The only other information came from Kubica's manager Daniele Morelli, who said in a television interview that Robert spoke "nearly normally" before being airlifted.