Lewis Hamilton's bid for a Canadian Grand Prix hat-trick ended after just eight laps on Sunday when he collided with McLaren teammate Jenson Button in wet conditions.
Hamilton, twice a winner in Montreal in three visits, was attempting to overtake Button along the pit straight when they touched and he was squeezed into the wall damaging the left side of his car.
"What's he doing?" Button asked in amazement over the team radio while Hamilton parked his damaged car on the track, bringing out the safety car.
Stewards, who have seen Hamilton repeatedly already this season, said they would investigate the collision after the race.
McLaren assured Button that his car appeared to be undamaged.
The safety car had already been deployed at the start, with rain and spray making the twisting and challenging Circuit Gilles Villeneuve all the more treacherous.
