A seven-year-old boy who died after falling from a steam traction engine at Beamish Museum in County Durham has been named as Karl Doran from Darlington.
Police have also confirmed that the vehicle was being driven by Karl's father, 41-year-old Phillip Doran, a regular volunteer at the museum, which is an open air attraction depicting Victorian life in the North East.
A post-mortem examination confirmed the child suffered a fatal head injury. North East Ambulance Service said he died at the scene on Sunday afternoon.
It is understood the boy was riding on the steam roller, which was being driven along a road adjacent to the railway line at the museum, when he fell and was hit by the vehicle's trailer.
Mr Doran was taken to hospital suffering from shock immediately after the incident but has since been able to speak to officers.
DCI Victoria Fuller, who is leading a joint investigation, said: "We are treating this as a tragic incident and are working with our colleagues in the Health and Safety Executive to establish the exact circumstances.
"We have already spoken to a number of witnesses but need to speak to some key people who may have been on a bus or tram which passed the traction engine around the time of the incident which occurred at around 3pm (on Sunday)."
The museum's director Richard Evans said at the weekend: "We are naturally very shocked and our thoughts are with the boy's family at this time.
"We took the immediate decision to close the museum for the rest of the day while we support the investigation."