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The air ambulance has landed in a Tovil car park.
It landed at around 9.10am at the Cornwallis Suite at the Maidstone Masonic Centre.
No other emergency vehicles have been spotted at the incident on Courtenay Road.
Kent, Surrey and Sussex Air Ambulance has confirmed crews were called to attend a medical job in the Maidstone area at 9.09am.
The helicopter left at around 9.55am after medics were stood down.