Torrential rain brought a red-flag suspension to the Canadian Grand Prix on Sunday after 25 of the scheduled 70 laps.
World champion Sebastian Vettel, who started from pole in his Red Bull, was in the lead when the race came to a halt.
“It's the right decision to stop the race,” said Red Bull boss Christian Horner. “The drivers are just passengers, the water lifts the cars up and there is no drive.”
The race had started behind the safety car because of the wet conditions.
Hamilton crashes out
Former world champion Lewis Hamilton crashed out of the race after colliding with McLaren teammate Jenson Button after just eight laps.
Hamilton came off worst when he tried — and failed — to go up the inside of his fellow Briton.
“What's he doing?” complained Button over the team radio as the safety car was summoned onto the track.
It was the second successive controversial race for the 26-year-old Hamilton.
