A strong, 6.2-magnitude earthquake struck in the Sea of Marmara on Wednesday, according to the United States Geological Survey. The temblor happened at 12:49 p.m. Eastern European time about 25 miles southwest of Istanbul, data from the agency shows.

The biggest of the tremors to hit Istanbul was felt some 275 miles away (440km) in the capital, Ankara, according to Mayor Mansur Yavas. It's a measure of how powerful the 6.2-magnitude quake was. Officials from the Istanbul Governorship say they haven't received any reports of earthquake damage yet.

A 6.2-magnitude earthquake struck off the coast of Istanbul on Wednesday leading to scenes of panic in the Turkish metropolis, officials said.