St. Louis County police said in a news release that officers responded around 6 p.m. Monday to the Casa Dia Montessori school. The child was rushed to a hospital, where he was pronounced dead.
The Montessori said in a statement that the boy was unresponsive in his mother’s van when she arrived there at the end of the day. The statement described the death as a “terrible accidental loss.” Police say the boy may have been left in a vehicle for “an extended period of time.”
An autopsy is planned for Tuesday. The boy’s name wasn’t immediately released.