“An explosion rocked a central square in Istanbul on Tuesday, killing at least 10 people and wounding 15 others, the Istanbul governor’s office said. Officials feared the toll may include foreign nationals.
The city’s Sultanahmet Square was swarming with security forces and ambulances in the aftermath of the blast. The heavily guarded area is Istanbul’s tourist hub — the cultural and historic heart of the city. The Blue Mosque and Hagia Sophia are located there.”
Source: Istanbul: Explosion in central square kills at least 10 – CNN.com