ATHENS/ISTANBUL, Rajab 25, 1435, May 24, 2014, SPA -- An earthquake of 6.4 magnitude struck off the coast of northern Greece on Saturday, sending panicked residents into the streets in Greece, Turkey and Bulgaria, Reuters cited officials as saying. In Turkey, about about 270 people were hospitalized, most with minor injuries, as a tremor shook buildings, the government diaster and emergency department (AFAD) said. The quake also rattled Turkey's most populous city, Istanbul, as well as the Aegean coastal city of Izmir and the popular tourism province of Antalya on the Mediterranean coast. One person was in critical condition after jumping from a balcony in the western Turkish town of Canakkale, AFAD said. Hurriyet Daily News reported 30 people injured jumping out of apartments in the town and patients in one hospital were evacuated after cracks emerged in the building. The U.S. Geological Survey (USGS) said the quake occurred 69 km (42 miles) south-southwest of the Greek city of Alexandroupolis, between the islands of Lemnos and Samothrace, at a depth of 10 km (6 miles). -- SPA 19:17 LOCAL TIME 16:17 GMT www.spa.gov.sa/w