Emergency services are responding to an incident at Wellesley St in Auckland.

Police were called at 6.15pm to an incident in central Auckland at the Wellesley St motorway overbridge, Grafton, a spokesman said.

A witness said around six police cars are at the scene.

A person has been transported to Auckland Hospital with critical injuries.

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Parts of the motorway were closed for a time while police responded but are now open.

Police thanked motorists in advance for their patience if they experience delays in the area.