The Reina nightclub attack in Istanbul in the first hours of the new year led to a flurry of speculation on the identity of the attacker, who managed to escape and is still on the run.
The alleged attacker, who killed 39 people and wounded 68, initially was identified as a Uighur Turk and then as Kirghiz. The latest reports from security sources, however, identified him as an Uzbek national of Tajik origin named Abdulkadir Masharipov who uses the Islamic State (IS) alias Abu Mohammed Khorasani.