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.”
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.
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.