Turkish police seal off historic Istanbul square after blast

ISTANBUL - Turkish police sealed off a central Istanbul square in the historic Sultanahmet district on Tuesday after a large explosion, a Reuters witness said, and the Dogan news agency reported several people were injured in the blast.

Ambulances rushed to the scene of the explosion in Sultanahmet square, close to the Blue Mosque and Hagia Sophia, in a major tourist area of Turkey's most populous city.