MONTREAL: Police in Montreal are clamping down on any attempt by protesters to disrupt Sunday's Formula One Canadian Grand Prix race.

Police spokeswoman Anie Lemieux said about 30 people have been arrested at the subway stop near the race track as a preventive measure.

Some protesters had wanted to fill the subway stop with their supporters to make it difficult for fans to get to the race but the main downtown hub was filled with police officers in yellow jackets instead, checking any commuter with a back pack and red square, the symbol used by student protesters who have been demonstrating for more than three months against university tuition hikes.

Officers patrolled the corridor leading to the line travelling to the race venue, and were on every train car as well.