Firefighters and hydro workers were still on the scene of a series of blasts early this morning in Toronto's financial district.
The explosions, blamed on an overheated hydro vault fire, shut down the area yesterday at about 5 p-m and sent commuters scrambling.
Heavy black smoke billowed from a set of grates outside a Royal Bank office building near King Street and Yonge Street.
A series of underground blasts followed as officers herded crowds away from the scene.
There were no reports of any injuries.
The incident shut down a nearby subway station and caused several streetcars to take detours.
Toronto transit officials later said subway service and some bus routes through the area had resumed but streetcars were still being diverted.
A section of King Street remained closed early this morning and it was unclear whether it would open in time for the morning rush hour.
Toronto Fire Platoon Chief Kevin Shaw says the fire's cause would likely be determined once hydro crews gained access to the vault.