Toronto fire crews responded to a two-alarm blaze, as several propane cylinders ruptured atop a building in the downtown core on Friday night.

Toronto police say they were called about reports of a fire on the roof of a building under construction at 296 Richmond Street West near John Street around 6 p.m.

Video sent to CityNews shows plumes of smoke and at least one explosion on the rooftop of a building on Richmond Street.

Other videos posted to social media show a fire burning on the rooftop of a building.

“Information received that items are possibly exploding and debris may be falling onto the street below,” police said in a social media post.

The fire was extinguished, and there were no reports of injuries. Fire officials added that the blaze did not appear to have spread to nearby buildings.

The cause and origin of the blaze are under investigation.

The area surrounding the fire was busier than normal with pedestrian and vehicular traffic, as it is just north of the Rogers Centre, where the Toronto Blue Jays were playing their home opener on Friday night.