Six people are being treated in hospital after a woman crashed her car into a crowd following Eid celebrations with her family.
The 42-year-old woman was arrested after the collision, which happened at around 9.14am outside Westgate Sports Centre, in Newcastle, where a large number of Muslim people were attending prayers for the religious festival.
Northumbria Police said they had no reason to believe the incident was terror-related.
The six casualties, including three children, were taken to the Royal Victoria Infirmary.
Two of the children are in paediatric intensive care and one adult is in the trauma high dependency unit. The remaining three are believed to have serious but not life-threatening injuries, police said.
Assistant Chief Constable Darren Best said: "At approximately 9.14am we received reports that a car had collided with pedestrians outside of Westgate Sports Centre, in Newcastle city centre.
"At that time a large number of people were in the area celebrating the religious festival Eid that is held to mark the end of Ramadan. What we have established is that a 42-year-old female has been celebrating Eid with her family, she then got into her car and has collided with six people in the crowd.
"We have no information to suggest this is terror-related."
Mr Best said extra officers are on patrol around communities in the area to answer any questions or concerns.
Specially trained family liaison officers are working with the affected families.
Earlier, a North East Ambulance Service spokesman said: "We received our first 999 call at 9.15 this morning to report a car that had mounted the kerb.
"We have taken six people to hospital. They have gone to the Royal Victoria Infirmary in Newcastle, three children and three adults."
A statement from the nearby Newcastle Central Mosque said the collision happened immediately after people were leaving the area following Eid prayers.
It said: "We pray that all those affected recover soon fully. We thank the emergency medical services, the police and over 100 volunteers from the mosque for their quick response.