Witness accounts suggested between 400 and 750 people had packed a fishing boat that capsized and sank early on Wednesday morning about 50 miles from the southern coastal town of Pylos.
"The High Commissioner reiterated his call to states to open up more regular migration channels and enhance responsibility sharing, ensure arrangements for the safe and timely disembarkation of all people rescued at sea, and the establishment of independent monitoring and oversight of migration related policies and practices."
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