IZMIR / ESKISEHIR, Turkey

Turkish police arrested 76 suspects nationwide for their alleged links to the Fetullah Terrorist Organization (FETO), the group behind the 2016 defeated coup, security sources said on Friday.

Provincial anti-terror and intelligence teams determined that 66 suspects frequently changed their addresses to avoid being caught, and used to rent "safe houses" through their relatives, who do not have a record of links to the terror group, said the sources, who asked not to be named due to restrictions on speaking to the media.

The operation to capture the identified suspects was carried out as part of an investigation initiated by prosecutors in the Aegean Izmir province.

The suspects -- including alleged senior members and "covert imams" of the terror group -- were rounded up in Izmir-based operations in the early hours.

During the raids, police also seized undisclosed sums of money, fake documents and digital materials.

Separately, 10 other FETO suspects were arrested in an operation based in the central Eskisehir province -- including the Istanbul, Mugla, and Diyarbakir provinces -- against the terror group's infiltration of the military, said a security source.

The arrests came after prosecutors in Eskisehir issued warrants for the suspects, including active-duty military officers, the source added.

FETO and its US-based leader Fetullah Gulen orchestrated the defeated coup of July 15, 2016 which left 251 people martyred and nearly 2,200 injured.

Ankara also accuses FETO of being behind a long-running campaign to overthrow the state through infiltration of Turkish institutions, particularly the military, police, and judiciary.

Since the coup attempt, tens of thousands of FETO suspects have been arrested, including many in the armed forces, police, judicial system, and education sector.

*Writing by Jeyhun Aliyev and Sena Guler in Ankara