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Hydro vault fire in downtown Toronto to blame for heavy smoke, underground explosions

Click to play video: 'Underground explosions force closure of busy downtown Toronto streets'
Underground explosions force closure of busy downtown Toronto streets
WATCH ABOVE: Several underground explosions forced the closure of downtown Toronto streets near the intersection of King and Bay Monday – May 1, 2017

Toronto police and fire crews are investigating the source of heavy, black smoke and the sound of an explosion heard in the city’s downtown core.

Toronto Fire Services said crews were called to King Street West near Bay Street before 5:15 p.m.

Police said on Twitter that officers received reports “that the loud explosive sound came from underground.”

WATCH: Smoke billowed from a sewer grate in Toronto near the intersection at King and Bay Monday. Police have confirmed the fire to have originated from a hydro vault.
Click to play video: 'Smoke billows from sewer grate in downtown Toronto'
Smoke billows from sewer grate in downtown Toronto

Officials said the series of explosions were caused by a hydro vault fire. Toronto Hydro crews were called in to investigate the extent of damage and the cause of the fire.

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Toronto Fire Services said the building at 20 King St. W. is being evacuated.

Officers said there were no reports of injuries.

With files from Mark Carcasole

WATCH: Toronto Hydro spokesperson Tori Gass updates the latest from near the scene in downtown Toronto where underground explosions originating from a hydro vault caused billowing smoke Monday afternoon.

Click to play video: 'Toronto Hydro says scene of downtown explosion remains very active'
Toronto Hydro says scene of downtown explosion remains very active

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