The ISIS-linked news agency Amaq has released a statement, claiming that ISIS takes responsibility for the Istanbul nightclub attack (more about it here).
In general, ISIS does not claim responsibility for attacks in Turkey even when Ankara says that the terrorist group is responsible.
So, Amaq’s statement could be described as a signal that the terrorist group is going to expand its terror activity in Turkey in response to Ankara’s military operation that targets ISIS in northern Syria.
Amaq’s statement: