The ship "Amber" which left the scene after the incident has been detained along with its crew after a massive search by the Navy and Coast Guard, Inspector General of Police (Ernakulam Range) P Vijayan told PTI.
The injured fishermen had been admitted to various hospitals here and the condition of two of them was stated to be serious, police said.
Another occupant of the boat was missing and a search operation was on to rescue him.
The 11 injured were rescued by fishermen in another boat, police said.
This is the second fatal incident involving a foreign ship in the sea off Kerala coast.
Earlier in February 2012, two fishermen were shot dead allegedly by Italian marines on-board an oil tanker Enrica Lexie.
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