Turkish police detained the co-mayors of the Uludere district of the southeastern province of Şırnak early on Jan. 26 as part of a terrorism-linked probe.

According to a tweet posted by the pro-Kurdish DİHA reporter Faruk Encu, the co-chairs Zeynep Üren and Yunus Ürek have been detained after Şırnak Public Prosecutor’s Office issued a warrant as part of an investigation into the Kurdistan Workers’ Party (PKK).

Police are reportedly continuing to search Üren’s home and the municipal office.

Turkey has stepped up its crackdown on Kurdish politicians in recent months.

On Wednesday, the Peoples’ Democracy Party (HDP) deputies Osman Baydemir and Ahmet Yıldırım were detained on Wednesday as part of the crackdown against Turkey’s Kurdish political movement.

Earlier on Wednesday, HDP deputies Mehmet Emin Adıyaman and İmam Taşçıer were detained.

All of the deputies were released after their testimonies during the day.

Baydemir had served as mayor of Diyarbakır between 2004-2014. The latest Diyarbakır mayor Gültan Kışanak was dismissed and sent to jail in October 2016 on alleged charges of terror links.