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It is believed a man has fallen around 30ft from a wall into a ditch below.
Police, ambulance and fire crews were called to Dock Road in Chatham at 12.30pm to reports a man had fallen from a wall at Fort Amherst.
The man, aged in his 30s suffered lower back pains and a suspected fractured wrist but was stable and taken by road to Medway Maritime Hospital.
It is thought he may have fallen from an un-restored section of the fort.
All emergency services worked together and the area is now cleared.