The Turkish Police has reportedly arrested eight people in connection with the gun attack on an Istanbul nightclub that killed 39 people on New Year's Eve.
However, the gunman is not among those arrested, reports the Guardian.
The Turkish military said it had carried out raids against ISIS in Syria in response to the attack. Turkish jets struck eight targets, and tanks and artillery fired on 103 targets near al-Bab, killing 22 fighters.
Meanwhile, the Islamic State has claimed responsibility for the attack.
"In continuation of the blessed operations that Islamic State is conducting against the protector of the cross, Turkey, a heroic soldier of the caliphate struck one of the most famous nightclubs where the Christians celebrate their apostate holiday," ISIS said in a statement.
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