Four people, including two children, have died after a boat carrying migrants overturned in the eastern Aegean.
Six other people were rescued after the capsize off the island of Lesbos on Wednesday.
The coast guard said the bodies of a girl, a boy, a man and a woman had been retrieved from the sea.
The first two people rescued told authorities they had been in an inflatable dinghy with nine other people when the vessel overturned as it headed to the island from the nearby Turkish coast.
Vessels from the Greek coast guard and the European border agency Frontex were involved in the search and rescue operation, which was continuing.
Lesbos has been the main arrival point for hundreds of thousands of refugees and migrants heading to Europe. But numbers of new arrivals have fallen dramatically following a March deal between the European Union and Turkey to limit the flow of refugees.
Many have died during the short but dangerous crossing, when their unseaworthy and overcrowded boats have capsized or sunk.