ATHENS, Greece (AP) — The Greek coast guard on Friday defended its response to a ship that went down off the country's south coast and left more than 500 migrants presumed drowned. Criticism mounted over Europe's yearslong failure to prevent such tragedies.

Patrol boats and a helicopter spent a third day scouring the area of the Mediterranean Sea where the packed fishing vessel capsized early Wednesday, in what the U.N. migration agency said could be the second deadliest migrant shipwreck recorded. The deadliest occurred when a vessel capsized off the coast of Libya en route to Italy in April 2015, killing an estimated 1,100 people.

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