The upheavals of the 1960s were also a time of conflict for some in Quebec. The emergence of extremist nationalist violence marked a dark chapter in the province's history, when in 1963, the first bombs of the Front de libération du Québec were detonated in Montreal. A major recognition of Quebec's cultural importance came in 1964 when, under authority granted by the Government of Canada, the Province of Quebec signed its first international agreement in Paris. The same year, during an official visit by the Queen, the police were required to maintain order during a demonstration by members of the Quebec separatist movement.