A baby boy has died and another child has been seriously injured after they were attacked by a dog.
Emergency services were called to an address in Harwich Road, Colchester, at 3.10pm on Thursday.
The boy who was wounded was left with "life-changing injuries", Essex Police said.
A woman was also taken to hospital with minor injuries after being bitten by the dog, whose breed is unknown.
Chief Inspector Elliot Judge said: "This is a tragic incident that Essex Police is investigating.
"Specially trained officers are providing support to the family at this difficult time."
Officers removed the dog from the property after the incident.