The Halifax explosion took place on December 6, 1917 when the SS "Mont-Blanc", a French cargo ship loaded with explosives collided with the SS "Imo", a Norwegian ship in the harbour in Halifax, Nova Scotia, Canada. 1,782 people were killed and over 9,000 people were injured. This was the largest man-made explosion in history until July 1945 when the first atomic bomb blew up. It is still the largest accidental explosion in history.