This happened last Thursday night, but, probably asleep early, I missed hearing the explosion.
Someone fishing in the Rideau River near the Vanier riverside park hooked a pack of dynamite instead of a fish. According to the Ottawa Citizen the police were "tight lipped" about the incident and nobody knows where the dynamite came from or how old or dangerous it was. Another version of the story claims that a canoeist found the wax-wrapped sticks of dynamite "floating in the water;" it wasn't the same kind of explosive used by the usual ice-breaking crews at the end of winter. The CBC corroborates this.