Migrant ghost ships: Who are the people smugglers?
Officials say the Ezadeen was carrying the Sierra Leone flag, while the Blue Sky M was sailing under a Moldovan flag.
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.
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?
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