Ontario Provincial Police say three people, including a child, were injured in an explosion at a campsite at the Tay River Tent & Trailer Park near Perth, Ont. Saturday, July 4, 2020. (Dave Charbonneau / CTV News Ottawa)

Ontario Provincial Police say a seven-year-old boy suffered serious burns in a reported explosion at a campground near Perth, Ont. 

Two other people were transported to hospital for treatment after the incident Saturday night. 

In a press release Sunday morning, Lanark County OPP said they were called to the Tay River Tent & Trailer Park on Christie Lake North Shore Road at around 10:30 p.m. Saturday, to help the Bathurst, Burgess, Drummond-North Elmsley Fire Department.

The incident was reported as "the explosion of a buried propane cylinder at a campfire," police said.

Lanark County OPP Const. Lori Lobinowich tells CTV News Ottawa the investigation into the incident continues. 

"Each site has a cemented or bricked fire pit in front of the property, so that was at one of the locations where it happened," Labinowich said Sunday afternoon. 

Lanark County paramedics and an Ornge air ambulance were also called to the scene. The three victims all had serious burns. 

Lobinowich says the boy suffered burns over a major part of his body, and remained in hospital Sunday afternoon. The two adults were treated and released.

The OPP is reminding people to be careful when setting up a campfire this summer.

"We just really want to make sure people, if they’re having fires, to be cognizant of what is being put in before you light the fire," said Labinowich.

"Clean out the ashes; make sure nobody’s thrown anything in there. Or when you’re doing it that nothing combustible goes in, because things like this happen."

OPP say the Office of the Fire Marshal was contacted and the investigation into the cause of the explosion is ongoing.

Map for refrence purposes.