A 9-year-old girl died after she was rescued in the waters near the Greek island of Kastelorizo, in the early hours of Thursday.
The girl was spotted at sea, together with her mother and another couple with their two children.
A vessel from the European border agency Frontex rescued the group, but the girl was pronounced dead by the time she was transferred to the local hospital in Kastelorizo.
It was unclear what type of vessel the migrants had used, and whether it sank or capsized.
Greek authorities launched a search and rescue operation with patrol boats and a helicopter, and crews later found and rescued another 20 people who had managed to swim to a rocky coast on the island.
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