Istanbul has been hit by a powerful 6.2 magnitude earthquake, Turkish officials have said, but there are no immediate reports of any damage or injures.
People were seen running out of buildings as the earthquake shook the city.
It had a shallow depth of 10km (about six miles), according to the United States Geological Survey.
The epicentre was some 40km (25 miles) southwest of Istanbul in the Sea of Marmara.
It was preceded by a 3.9 magnitude earthquake at 12.13pm, according to Turkey’s disaster and emergency management agency, and followed by several aftershocks, including one measuring 5.3.
Earthquakes are frequent in Turkey, as it is crossed by two major fault lines.
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