Migrant ghost ships: Who are the people smugglers?

Experts say it is part of a new tactic that has emerged in recent months, with smugglers using old freighters to transport hundreds of people - mostly Syrian refugees - from Turkey to EU countries.

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Just days earlier, the Blue Sky M, carrying 970 people, was found adrift in Greek waters. Who are the people organising these perilous journeys - and what is being done to stop them? More...