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.

More than 150 people were injured when they jumped from buildings in Istanbul on Wednesday as one of the strongest quakes in years hit the city.