A strong earthquake rattled Istanbul, Turkey, and neighboring regions, sending panicked people pouring into streets but apparently causing no major damage.

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.

The epicentre was 25 miles (40km) southwest of Istanbul in the Sea of Marmara. So far, local authorities have said there were "no serious cases", but several aftershocks have been felt.