Acting on decrypted messages from the DHKP-C command structure, Istanbul counter-terrorism units reportedly launched simultaneous operations in Istanbul, Izmir, and Balikesir provinces to arrest terror suspects allegedly preparing for terror attacks. 

The terrorist suspects were also believed to indoctrinating young recruits, said the sources, who asked not to be named due to restrictions on talking to the media.

During the raids, police also confiscated many organizational documents and digital materials.

The DHKP-C is responsible for a number of terror attacks in Turkey, including a 2013 attack on the U.S. Embassy in Ankara which martyred a Turkish security guard and injured a Turkish journalist.