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The Halifax Explosion was a disaster that occurred in Halifax, Nova Scotia, Canada, on the morning of December 6, 1917. A munitions ship, SS Mont-Blanc, collided with the Norwegian vessel SS Imo in the Narrows, a strait connecting the upper Halifax Harbour to Bedford Basin. The collision caused a fire on the Mont-Blanc, which eventually detonated its cargo of high explosives, leveling much of the Richmond District of Halifax.