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Hundreds of refugees are feared to have drowned in the Mediterranean Sea after their boats capsized.
Italy's President, Sergio Mattarella, said there seemed to have been "yet another tragedy in the Mediterranean".
His comments followed a report by BBC Arabic quoting the Somali ambassador to Europe that 400 people had died crossing from Egypt to Europe.
Reports said the refugees were fleeing to Italy from Somalia, Ethiopia and Eritrea in four boats which were ill-equipped for the journey.