Officers arrived at the scene to find the two kids had been pulled ashore by Grand Beach safety officers, RCMP said.
“The two children were in the water together and being supervised by the parents of the 12-year-old boy when one of the parents lost track of the children due to the setting sun,” RCMP Sgt. Bert Paquet said in a statement.
Emergency crews spent 30 minutes trying to resuscitate the pair but were unable to save them.
RCMP are investigating but said the drowning doesn’t appear to be suspicious in nature.
STARS spokesperson Cam Heke said the spot where the two drowned is “quite busy” and there were a lot of people nearby at the time.
“This was a very sad and very tragic call,” said. “Our heart goes out to everyone directly involved but also the broader community, because this was a very tragic and very public event.”