Fire crews were called to the Port of Felixstowe on Friday night to help ambulance crews remove a patient from a ship.
Residents reported seeing a large emergency service presence in the area shortly before 8pm.
Suffolk Fire and Rescue sent three appliances down to the scene from Ipswich East and Felixstowe.
A spokesman for the fire service said that crews were helping the ambulance service remove a patient from a boat in the docks for further medical treatment.
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