A powerful earthquake struck near the Greek island of Kasos early Wednesday, prompting tsunami warnings and widespread alerts across the southeastern Aegean.

A strong, 6.0-magnitude earthquake struck in the Mediterranean Sea on Wednesday, according to the United States Geological Survey. The temblor happened at 1:51 a.m. Eastern European time about 14 miles southeast of Fry, Greece, data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 6.1.

Greek authorities have issued a tsunami warning for Greece's largest island after a 5.9 magnitude earthquake struck off the eastern coast of Crete. The tremor hit near the islands of Kasos and Karpathos,