KYTHIRA, Greece (AP) — Strong winds were hampering efforts around two Greek islands Friday to find at least 10 migrants believed to be missing after shipwrecks left 23 people dead, officials said.

A dinghy and a sailboat sank in two separate incidents late Wednesday and early Thursday off the islands of Lesbos, near the coast of Turkey, and Kythira, south of the Greek mainland — prompting a dramatic nighttime rescue, with survivors hauled to safety up cliffs.

Coast guard, navy and volunteer rescuers focused efforts around a rugged cove on Kythira where the sailboat smashed into rocks and broke up, leaving bodies floating in the wreckage on Thursday.

Greek Prime Minister Kyriakos Mitsotakis, who was attending a meeting of European leaders in the Czech capital, Prague, blamed neighbor Turkey for failing to stop boats crammed with migrants from leaving its coastline.

“Once again, I call on Turkey to cooperate with Greece to stop these ruthless networks of traffickers of people in distress so no more lives are needlessly lost in the Aegean Sea,” he told reporters at the start of the meetings.

“The root of this problem is the boats leaving the Turkish coastline,” he said. “And there is no doubt that Turkey, if it wants to, can do more to tackle this problem.” ___ Follow AP's coverage of global migration: https://apnews.com/hub/migration