Greek and Turkish coastguards reported the deaths of at least 13 people off the coast of Turkey on Sunday.
A rubber boat carrying migrants headed for Lesbos collided with a ferry. Six children are believed to be among the dead.
There is confusion over whether reports of 26 people feared missing from a boat in the same area was a separate accident.
Twenty people were said to have been rescued. One surviver described his ordeal which happened in the early hours of the morning in the dark.
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