ROME (AP) — A boat carrying nearly 100 migrants capsized Wednesday in international waters off the Italian island of Lampedusa, killing at least 20 people and leaving a dozen missing, the U.N. refugee agency and local officials said.

There are 60 survivors from the perilous journey from Libya, but a UN agency says there could be more people missing.

Sixty people survived after two boats with nearly 100 migrants capsized. The causes of the shipwrecks were not clear, Italian officials and U.N. agencies said. The death toll is likely to grow.