FILE - In this Sept. 17, 2019, file photo, migrants aboard a blue plastic boat are seen in the Mediterranean Sea. The U.N. refugee agency is investigating why Malta last week allegedly asked the Libyan coast guard to intercept a migrant boat in a zone of the Mediterranean under Maltese responsibility, in possible violation of maritime law, a U.N. official said Tuesday, Oct. 22, 2019. (AP Photo/Renata Brito)

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