Toronto Fire Chief Matthew Pegg said the incident was related to a hydro vault fire that had been contained and controlled. Crews were dealing with smoke migration, he said.
Toronto Hydro said they were aware of a power outage at the building outside which the blasts took place and crews were dispatched to the scene.
Black smoke can be seen rising from what witnessed called a loud explosion in downtown Toronto business district, videos have been posted to Twitter.
— mike amsterdam (@plutoisnumber9) May 1, 2017
Update: reports are that the loud explosive sound came from underground. Cause not yet determined. No injuries reported at this point. ^adc
— Toronto Police OPS (@TPSOperations) May 1, 2017
— Derrick Shea (@derrickshea) May 1, 2017
— Emily (@EmilyCWYu) May 1, 2017
Explosion at Bay and King Street. pic.twitter.com/SpmycITi6L
— Herb Ladrillo (@hladrillo) May 1, 2017
More updates to come…