Orhan Erdemli, a lawyer who represented Turkish-Islamic scholar Fethullah Gülen for many years, was detained in İstanbul on Wednesday.
Many family members and people close to Gülen have also been arrested since a failed coup attempt on July 15.
Turkey experienced a military coup attempt on July 15 that killed over 240 people and wounded more than a thousand others. Immediately after the putsch, the Justice and Development Party (AKP) government along with President Recep Tayyip Erdoğan pinned the blame on the Gülen movement despite the lack of any evidence to that effect.
Although the Gülen movement strongly denies having any role in the putsch, the government accuses it of having masterminded the foiled coup. Fethullah Gülen, who inspired the movement, called for an international investigation into the coup attempt, but President Erdoğan — calling the coup attempt “a gift from God” — and the government initiated a widespread purge aimed at cleansing sympathizers of the movement from within state institutions, dehumanizing its popular figures and putting them in custody.
Over 135,000 people, including thousands within the military, have been purged due to their real or alleged connection to the Gülen movement since the coup attempt, according to a statement by the labor minister on Jan. 10. As of Feb. 1, 89,775 people were being held without charge, with an additional 43,885 in pre-trial detention due to their alleged links to the movement.