Twenty-six migrants were feared missing early on Sunday after a dinghy carrying 46 people sank off the Greek island of Lesbos, the coastguard said.
A search-and-rescue operation was under way and 20 other people were pulled from the water, a coastguard spokeswoman said. Their nationalities were not immediately known.
Rescues and sinkings have become almost daily occurrences in the often choppy seas off Greece's eastern islands.
Hundreds of thousands of mainly Syrian refugees have braved the short crossing from Turkey this year.
