Turkey has arrested two co-leaders and nine other MPs of Turkey's pro-Kurdish Peoples' Democratic Party (HDP), according to the country's interior ministry. 
The ministry said on Friday morning that detention orders for 13 MPs were issued, but only 11 were arrested as two were abroad.
Later in the day, another MP, Imam Tascier, announced through Twitter that he was being detained and one of the MPs in custody, Ziya Pir, was released. Eleven people remain in detention.
The HDP is the third largest party in the 550-seat Turkish parliament with 59 seats and the main political representative of the Kurdish minority.
HDP co-leader Selahattin Demirtas was arrested at his home in the southeastern city of Diyarbakir, the largest city in Turkey's mainly Kurdish southeast, while Figen Yuksekdag was held in the capital Ankara, the state-run Anadolu news agency said.
Anadolu reported the MPs were arrested for not appearing in court to testify for ongoing terrorism-related investigations.