A man is trapped between a crane and a lorry on a building site.
An air ambulance was seen landing on the former site of Pocklington House, Eastbury Avenue, Northwood, and paramedics were seen running down to a nearby building site.
Adam Gretton, spokesman for the East of England Ambulance Service, said a man was trapped between a crane and a lorry.
A specialist ambulance crew trained in dealing with hazardous situations is also on the scene.
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