The Islamic State in Iraq and Syria (ISIS) is claiming responsibility for the deadly New Year's attack that left at least 39 club patrons and staff dead at an upscale nightclub in Istanbul, Turkey.

"In continuation of the blessed operations which ISIS carries out against Turkey, a soldier of the brave caliphate attacked one of the most popular nightclubs while Christians were celebrating their holiday," a statement posted to Twitter reads.

The claim comes a day and a half after the attack.

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ISIS, however, did not provide evidence to prove that the attacker carried out the attack on its behalf.

The statement did not contain any information about the attacker.

It adds that "the apostate government of Turkey should know that the blood of Muslims who get killed by Turkey's planes and artillery will set afire inside their country."