05/17/2015 02:40 EDT | Updated 05/17/2016 05:59 EDT

Police suspect carbon monoxide poisoning after two men found dead in camper

PORTNEUF, Que. - Two men were found dead of apparent carbon monoxide poisoning in a camping trailer in Quebec's Portneuf region this weekend.

An acquaintance discovered the bodies of the two men in their late 50s or early 60s at the Batiscan-Neilson campground near Quebec City on Saturday.

A spokesman for the Quebec provincial police says the deaths did not seem criminal in nature.

No trace of violence was found on the bodies or at the site.

The deaths appear to be be due to carbon monoxide poisoning stemming from the camper's propane heating system.

A police investigation into the cause of death is underway.