Tuesday’s blast targeted a square in the Sultanahmet district, an area usually crowded with tourists a stone’s throw away from the Hagia Sophia and the Blue Mosque. There was no immediate claim of responsibility. The city’s governor said an investigation was ongoing to determine the perpetrator. Police sealed off the area and the government imposed a broadcast ban.

Confirming eight of the victims as German citizens, Berlin sent out an urgent travel warning to its citizens telling them to avoid gatherings or landmarks in Istanbul and Turkey as a whole. Peru’s foreign ministry said one Peruvian man was killed and a Peruvian woman was among the 15 people who were wounded. It was not known whether the bomber was counted among the dead.

source: the guardian

I made some pics from the crime scene one hour after the explosion: