Police said they were called to the 200 block of River Avenue with the first report, and evacuated people in the immediate vicinity as a precautionary measure.

Investigators used DNA and other evidence to link the man, identified as Anthony Quinn Warner, to the mysterious explosion but said they have not determined a motive.

Bomb threats via email were sent to libraries and schools across Ontario and Vancouver.

The 5.4-tonne bomb exploded underwater and did not cause any injuries, Poland's navy says.

It was not immediately clear who was responsible for the blast, which came during the Islamic holy month of Ramadan.

A group of climbers were on the north side of Mt. Athabasca when they found the old Second World War-era explosive.

Julia Ann Poff pleaded guilty in a Houston federal court Monday to transporting explosives with intent to kill, injure or intimidate.

Two days after police were called to a west Edmonton neighbourhood after a homeowner reported that he found what he believed to be a bomb under his vehicle, police confirmed the object that was discovered was indeed an explosive device.

An exploded pipe bomb was found in a garbage can in Banff National Park on Tuesday, according to RCMP.

Cities across Canada and the U.S. were targeted by the bomb threats on Dec. 13, prompting evacuations and shutdowns in Aurora, Ill., Raleigh, N.C., and Atlanta, Ga.