A 25-year-old man was critically injured when he lost control of a motorcycle while fleeing police in Porirua this afternoon.

Police said the man lost control and crashed at the intersection of James Cook Drive and Shoal Place in Whitby shortly after 2pm.

He suffered serious injuries and was taken to Wellington Hospital, where his condition was described as critical.

The police serious crash unit was investigating.

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The pursuit and crash will be referred to the Independent Police Conduct Authority.