A 38-year-old woman and her five-year-old son died in hospital after they were found without vital signs in a backyard in Brampton, Ont. according to Peel Regional Police.

Emergency crews responded to reports of an unresponsive child and an adult in a pool on Hilson Court shortly after 8 p.m. on Saturday.

Several neighbours rushed to help after two were found without vital signs. They attempted to resuscitate the boy who was found lying on the patio, and pulled the woman from the pool.

Paramedics rushed them to a local hospital for treatment, where they were pronounced dead.

Neighbours say that the pool was not full at the time, and had dirt and grime in the water.

On Sunday, investigators said they had not yet determined what caused the incident.