Several emergency services vehicles were called to a village near Norwich.
Four police cars, a critical care ambulance and two other paramedic vehicles were seen in Southcroft, Hethersett, at 3.30pm on Saturday.
An eyewitness at the scene described it as a "large police presence".
A spokesperson for Norfolk Constabulary confirmed officers were "carrying out duties" on scene but was unable to give any extra information.
By 5.30pm, all the emergency service crews had gone.
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