Explosion occurs near Istanbul's Bayrampa?a metro station

A mysterious blast has occurred near Istanbul's central Bayrampa?a metro station with the Istanbul governor stating that the cause of the explosion remains unknown.  

At least six people were wounded, according to Anadolu Agency, which said the blast occurred at an overpass by the metro station.

The windows of a passing metro wagon were broken, after which passengers were evacuated.

Istanbul Metropolitan Municipality, however, only announced that metro lines were cancelled due to a "sound resembling an explosion."

Reports of the blast went viral on social media, with users from various locations across the city reporting that they heard an explosion.

Ambulances have been dispatched to the scene.

In Photos: Diyarbak?r Bar Association head laid to rest after murder

In Photos: Russian naval ship traverses Dardanelles amid Turkey-Russia crisis

Turkey sends body of downed Russian jet pilot to Moscow

Halfeti - A town of mesmerizing beauty

Exhibition shows Istanbul through eyes of children

Secret weapons of Turkish army: locally produced rocket launchers, missile systems

The bugs of Ankara: The weirdest scenes that anyone can run into in Turkish capital

A bird's eye view tour of Turkey's eastern provinces of Van and Hakkari

Turkish man with four wives has his 32nd child

Turkish police raid Koza ?pek's media HQ in Istanbul amid protests

Turkey celebrates Republic Day against backdrop of political turbulence

Local authorities in Ad?yaman stir outcry for sitting under tent as schoolkids get wet

US destroyer completes exercise with Turkish Navy

New images of the construction of Istanbul's third bridge

Turkey marks the...