A strong earthquake of magnitude of up to 7.0 struck the Aegean Sea on Friday and was felt in both Turkey and Greece, local and international observatories said.
People flooded to the streets in the Turkish coastal city of Izmir after the earthquake, witnesses said.
No casualties were immediately reported.
“So far, we have received information about six collapsed buildings” in Izmir province, which includes the city, Turkish Interior Minister Suleyman Soylu said on Twitter.
Environment Minister Murat Kurum said he knew of five collapsed buildings. “Some of our fellow citizens are stuck in the rubble,” he said.
Turkey’s Disaster and Emergency Management Presidency (AFAD) put the magnitude of the earthquake at 6.6, while the US Geological Survey said it was 7.0. It struck at around 11:50 GMT and was felt along Turkey’s Aegean coast and the northwestern Marmara region, local media said.
The epicentre was some 17km (11 miles) off the coast of the Izmir province, at a depth of 16 km, AFAD said. The US Geological Survey said the depth was 10km and the epicentre was 33.5 km off Turkey’s coast.
The quake was felt across the eastern Greek islands and even in the Greek capital, Athens. Greek media said the residents of Samos and other islands fled their homes, while some rockfalls were reported.
There were no immediate reports of injuries. Both countries reported aftershocks.
Residents of Samos, an island with a population of about 45,000, were urged to stay away from coastal areas, Eftyhmios Lekkas, head of Greece’s organisation for anti-seismic planning, told Greece’s Skai TV.
“It was a very big earthquake, it’s difficult to have a bigger one,” said Lekkas.
Ali Yerlikaya, the governor of Istanbul, where the quake was also felt, said there were no “negative” reports.