Turkish security forces on Thursday held 14 suspects over ties to the Fetullah Terrorist Organization (FETO), the group behind the 2016 defeated coup, a security source said.

They were rounded up after prosecutors in Ankara issued arrest warrants for 20 people, including four serving officers, as part of an investigation into the terror group’s secret structure in the Gendarmerie General Command, the source said, asking not to be identified due to restrictions on speaking to the media.

Security forces continue with simultaneous operations across 12 provinces to arrest the remaining suspects.

FETO and its US-based leader Fetullah Gulen orchestrated the July 15, 2016 defeated coup, 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 the infiltration of Turkish institutions, particularly the military, police and judiciary.

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