A man in his 30s died after being struck by an ambulance transporting a patient on the A19 near Sunderland, Northumbria Police said. Emergency services were called shortly after 02:00 GMT. The ambulance was travelling on the northbound carriageway and was not using its blue lights when it hit the man, who died at the scene. No-one in the ambulance was injured. The driver, a man in his 40s, remained at the scene to assist police with their inquiries. Officers from the force’s roads policing unit have launched an investigation into the collision. Police said it happened on the A19 between the junctions for the A1018 and A690. Anyone with CCTV or dashcam footage of the incident, or the moments leading up to the collision, has been asked to contact Northumbria Police. The investigation is ongoing, with police appealing for information as they work to establish what happened.