The boat left central Niger state and was heading to northwest Kebbi state when it split and sank, local officials say.
The boat carrying 19 irregular migrants capsized off the coast of Cesme in the Aegean province of Izmir.
The UN says 4,220 lives have been lost in the Mediterranean Sea so far this year, making it the deadliest year for refugees.
UN refugee agency confirms at least 700 refugees have drowned in the Mediterranean since Wednesday, while some estimates put the death toll at 900.
At least 21 Rohingya Muslims die as their boat capsizes off coast of Myanmar's Rakhine state
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