Turkey has detained almost two dozen suspected ISIS militants in Istanbul as it extends a crackdown on the extremist organization ahead of the New Year, police sources said Thursday. Police carried out simultaneous raids Tuesday and Wednesday at 48 addresses in the countrys biggest city, the sources said, taking 20 ISIS suspects into custody. Their nationalities were not revealed, Agence France Presse reported. In 2017, a New Years Eve attack on an Istanbul nightclub that killed around 39 people was claimed by ISIS. Since October, Turkey has boosted efforts to repatriate ISIS militants to their countries of origin, after launching a military offensive in northern Syria.