Canadian Prime Minister Mark Carney has announced three by-elections on 13 April - races that could give his party a majority in the government. Two of the by-elections will be held in Toronto, in constituencies that are considered strongholds for Carney's Liberal party, while the third will be a closely watched contest in Montreal where his party won by just one vote last year. If they win all three seats, the Liberals would secure a narrow majority government, allowing the prime minister to