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Authorities in Cleveland say a 3-year-old boy died from accidental carbon monoxide poisoning after riding for hours in a van that had no catalytic converter to properly remove the odorless gas.

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His father found Lorne Johnson Jr. unresponsive in the back seat after running errands on Sunday. The father called 911 and tried unsuccessfully to revive the boy, who died at a hospital.

Cleveland.com reports police records indicate the boy had earlier told his father that he felt tired and then laid down in the back seat.

The father and a teenage son who had been in the vehicle also were treated for elevated carbon monoxide levels.