Police are investigating whether homeless people trying to keep warm Sunday led to the third fire in a week at a makeshift camp near downtown Toronto streets.

Police said they received multiple calls for a fire and heavy smoke to Yonge Street and Lake Shore Boulevard West, with the earliest coming in shortly after 2 p.m., Const. Alex Li said.

“There were also reports of explosions heard, possibly from propane tanks,” Li told the Star.

The fire has been put out and Toronto Fire Services is conducting checks for hot spots, Li said.

No injuries have been reported.

A structural engineer from the city will inspect the damage on scene, police said.

This is the third homeless camp in downtown Toronto to catch fire in the past week. A fire near Bayview Avenue and Corktown Common Trail broke out on Feb. 23, and firefighters were called the next day to a camp near the Gardiner Expressway and Jameson Avenue.

Li said police are not investigating a criminal link between the incidents. He said people were likely trying to find heat sources because of the cold weather.

“Whether it be utilizing a propane tank to conduct these heat sources or starting a fire . . . Obviously these tents are flammable, whatever they’re using is flammable and you know they are in small spaces,” Li said.