Greek authorities say more than 100 immigrants believed to have arrived illegally by sea have been found on the coast of Gavdos, an islet off the southern island of Crete.

The coast guard says the migrants, whose nationalities and state of health are not yet known, were spotted earlier Thursday by a passing merchant ship. So far, 145 people have been located, and there are no reports of others missing at sea.

Greece is a major entry point for refugees from war-afflicted parts of the Middle East and Africa, and economic migrants seeking a better life in the European Union.