At least 10 dead and 15 injured after a strong explosion on Tuesday morning near the Blue Mosque in Istanbul, located in the tourist area of Sultanahmet.
Although still it causes a witness claims appeared to be a suicide attack are unknown.
The incident occurred at about 8 am.
The explosion could be heard more than a kilometer away and a large number of ambulances are on site.
The area has been cordoned off by the police, traffic on adjacent streets is interrupted and the nearby tram has stopped running as a precaution.
Since the Blue Mosque is one of the most touristic places in Turkey, there is speculation of an attack intended to damage one of the main industries.
Notably, Turkey has been the scene of frequent attacks, claimed by different terrroristas organizations.
On October 10, around a hundred people died in an attack in Ankara.