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The air ambulance landed in a field after paramedics were called to a house.
Paramedics were called to treat a patient who had fallen ill at a Cuxton home this afternoon.
The helicopter landed in a field off Bush Road and joined crews from the ambulance service, who had been called to help someone at a private address nearby.
Witnesses reported seeing the aircraft, which is based at Rochester Airport, flying over the Medway towns.
Two ambulances and a paramedic car were seen in the village at about 3pm.
An ambulance service spokesman confirmed paramedics were called out but could not provide further details to protect patient confidentiality.