An explosion rocked ?stanbul's central Sultanahmet Square, a major tourist attraction, on Tuesday, leaving 10 people killed and 15 people wounded, the ?stanbul Governorate said.
The cause of the explosion, which took place at around 10:20 a.m. close to Dikilita?, was not immediately clear. The explosion was heard in nearby districts, according to witnesses.
Police tightened security measures around the area and sealed off the central square after the blast, barring people from approaching in case of a second explosion.
Sultanahmet Square is ?stanbul's main sight-seeing area and is home to Topkap? Palace and the Blue Mosque.