Kidnappings of seafarers increased 44% in 2016, according to research by consultancy Global Risks.
The rise was due to a higher number of incidents in the Gulf of Guinea and in the Sulu and Celebes Seas around the Philippines, it said.
But vessel hijackings fell 83% last year, compared to 2015, it added, as improvements were made in regional law enforcement..
And the total number of maritime security incidents dropped 21%.
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