An investigation is underway after a three-year-old boy died in a "medical incident" in County Durham.
Emergency services were called to a property in Ushaw Moor, near Durham, at about 4:15pm on Saturday 5 November.
Paramedics from North East Ambulance Service attended but the boy later died in hospital.
A multi-agency investigation is now underway into the circumstances surrounding the death.
A spokesman for Durham Police said: “On Saturday, Durham Constabulary supported the North East Ambulance Service (NEAS) in attending a medical incident in Ushaw Moor. The incident involved a three-year-old boy, who sadly died later.
“We are involved in a multi-agency investigation into the circumstances surrounding the death of the child and the public will notice an increased police presence in the area over the coming days while enquiries are conducted."
A NEAS spokesperson said: "We were called to a private address in Ushaw Moor, County Durham at 16:10pm on Saturday 5 November. We sent one clinical team leader, one specialist paramedic and two emergency ambulances. We requested support from Great North Air Ambulance (GNAAS)."
A spokeswoman for GNAAS said: "Our critical care team were activated at 4:16pm to reports of a medical incident in Ushaw Moor. They arrived on scene at 4:31pm and two of our doctors and a paramedic worked alongside the North East Ambulance Service (NEAS) to assess and treat a patient.
“The patient was taken to hospital by a NEAS road crew, accompanied by our team."
Want a quick and expert briefing on the biggest news stories? Listen to our latest podcasts to find out What You Need To know...