An explosion in the heart of Istanbul’s historic Sultanahmet tourist district killed 10 people. Photo: Twitter.

A Syrian suicide bomber is thought to be responsible for an attack which killed at least ten people including foreigners in the heart of Istanbul’s historic Sultanahmet tourist district on Tuesday, President Tayyip Erdogan said.

There was a high probability Islamic State militants were behind the blast near the Blue Mosque and Hagia Sophia, major tourist sites in the center of one of the world’s most visited cities, two senior Turkish security officials told Reuters.

Read full story at Reuters.