Mutlu is the latest in a string of opposition officials to be arrested in recent months in a clampdown on opposition to Turkish President Recep Tayyip Erdoğan.
In August, İnan Güney, the mayor of Istanbul’s Beyoğlu district was taken into custody for alleged corruption.
In March, Istanbul Mayor Ekrem İmamoğlu — Erdogan’s top political rival — was sent to prison on charges of corruption and aiding a terrorist group, despite massive protests. A new trial against him began on Friday, where İmamoğlu faces charges of falsifying his university degree.
Mutlu, Güney and İmamoğlu are all members of Turkey’s largest opposition party, the social democratic CHP.
