SUPPORTERS of the losing candidate in Niger's presidential election burnt tyres, threw rocks and set several buildings on fire yesterday, in a third day of violent protests in the capital Niamey. Niger's electoral commission on Tuesday declared ruling party candidate Mohamed Bazoum the winner of Sunday's runoff election with 55.75% of the vote, but his rival, Mahamane Ousmane, a former president, has alleged fraud and claimed he won with 50.3%. The election is meant to lead to the first transition from one democratically elected leader to another following four coups since independence from France in 1960. President Mahamadou Issoufou is…