(BBC News) Italy has threatened to stop vessels of other countries from bringing migrants to its ports.
The warning came as Italy's EU representative, Maurizio Massari, warned in a letter to the bloc the situation had become "unsustainable".
Prime Minister Paolo Gentiloni has accused other European nations of "looking the other way".
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An estimated 10,000 people are believed to have attempted the journey from North Africa in the past four days.