Motorists are being advised to avoid the William Street, Francis Street and Diamond areas of Derry following a car crash.
The collision, believed to have involved two vehicles, occurred within the last 15 minutes at the roundabout close to the City Baths on William Street.
Emergency services are understood to be on their way to the scene.
No one is thought to be seriously injured, however traffic is beginning to back-up in the area.
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