Las Vegas police say they're continuing to investigate the death of a 4-year-old boy whose body was found after he was apparently left for 17 hours in the sun-baked family vehicle.

The Clark County coroner's office says it could take several days or weeks to determine the cause of death.

Police say no charges were immediately filed against the child's parents, who according to a church member had seven boys.

The child's body was found a little before 8:30 a.m. Monday at the home several blocks east of downtown Las Vegas by a sibling.

Police Lt. Ray Steiber says the boy had been in the sport utility vehicle since the family returned home from a Sunday outing.

Authorities say Sunday temperatures in Las Vegas peaked at 90 degrees about 6 p.m. at McCarran International Airport.

At that heat, temperatures inside a vehicle can top 130 degrees within an hour, according to a San Francisco State University study.