A spokesman for the service said a number of crew were unaccounted for.
Kaimes Beasley, the duty controller for UK Coastguard, said: “One person was found on the upturned hull and rescued but we understand there were other crew on board. We are currently searching for these missing crew with a number of search units.”
The Coastguard search and rescue helicopter based at Lydd, two lifeboats from Ramsgate and the Coastguard rescue team from Margate have been scrambled to join the search.
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