Drivers are being advised to avoid Whitchurch Road in Gabalfa, Cardiff, where South Wales Police is dealing with an incident.
South Wales Police said officers are at the scene and that the road is grid locked in both directions between the top of Whitchurch Road and Crwys Road.
The force said traffic was expected to build up in the area for some time. It advised motorists to avoid the area and use alternative routes where possible, and said delays are expected.
Police have not said what the incident is. This story will be updated if more information is released.
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