The bodies of 34 migrants, at least seven of them children, were found at two sites along Turkey's Aegean coast on Tuesday after they apparently tried to cross to the nearby Greek island of Lesbos.
The flow of migrants, mostly fleeing Syria's civil war in search of sanctuary in Europe, has continued despite colder winter weather, though the numbers have dipped somewhat.
About one million people are believed to have crossed or attempted to cross the Aegean in 2015, nearly five times more than in 2014.
The people found on Tuesday died after their boat or boats apparently capsized in rough seas.
It was not known how many vessels were involved or how many people were on board.
The coast guard and gendarmerie rescued 12 others from the sea and the rocks on the Ayvalik coastline.
The coast guard said three boats and a helicopter were searching for more survivors.