Somalia's president, prime minister and speaker of parliament have issued a joint condolence to the nation over an unconfirmed report that some migrants may have drowned in the Mediterranean Sea on a trip from Libya to Italy.

Reports of the drownings are circulating among families but so far remain unconfirmed by coast guard authorities in Italy or Greece.

Somalia's state radio quoted Somalia's ambassador to Egypt when reporting the incident.

The joint statement from the Somali leaders said that 400 migrants, mostly Somalis, drowned when their boat capsized in the Mediterranean Sea on a trip from Libya to Italy. But the Somali information minister later said that 200 drowned.