Deadly bombing lays bare worsening security situation

A suicide bombing attack on Istanbul's historic Sultanahmet Square on Tuesday has left 10 people dead, among them nine German tourists, laying bare a worsening security situation in crises-ridden Turkey.

The square, a famed tourist hub that sits next to the city's must-sees like Hagia Sophia, Topkapi Palace and the so-called Blue Mosque, draws tens of thousands of tourists from across the globe every day.

Addressing a gathering of ambassadors in Ankara, Turkish President Recep Tayyip Erdogan blamed a Syrian suicide bomber for the blast.