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A woman is said to have been taken to hospital after emergency services descended on Borstal recreation ground near Rochester.
The nature of the incident remains unclear, but witnesses said an air ambulance landed at the scene and a road ambulance and police were also present.
The helicopter was said to have first appeared in the area at around 8pm.
Witnesses said a woman was taken to hospital and the helicopter left the scene at 9.45pm.
A woman had fallen from Medway Bridge and was flown to a London hospital.