Canadian Prime Minister Justin Trudeau has been hit by gravel thrown by protesters during a campaign stop.

He was returning to his bus after visiting a brewery when he was pelted by gravel. He was not injured.

Mr Trudeau called a snap election in mid-August, in the hope of gaining a majority government for his left-of-centre Liberal party.

But his campaign has been disrupted by demonstrations against Covid-19 vaccine mandates and other restrictions.

Just over a week ago, the prime minister was forced to cancel an election rally after a crowd of angry protesters ambushed the event.