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.

An earthquake occurred in Crete, which has caused a tsunami warning to be issued. Here's what it means if you're in the Crete and Greece areas.