“The child sustained serious injuries and was taken to hospital where, sadly, he died,” a police spokesman said.
Specialist officers have been supporting the family of the child, whose age has not been revealed.
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Epping Road, which connects Chipping Ongar with North Weald Bassett, was closed after the incident.
Detectives “continue to appeal for witnesses and anyone driving in the vicinity at the time who may have captured footage on dash cam to contact them”, the spokesman added.
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