Three people from the main opposition Republican Peoples’ Party’s (CHP) youth branch in Sakarya’s Serdivan district were battered by an angry mob who chanted “La Ilaha Illallah,” over a banner they hanged inside a shopping mall.

Banners reportedly read: “Turkey is secular and will remain secular,” and “We are soldiers of Mustafa Kemal.”

Mustafa Kemal Atatürk is the secular founder of modern Turkey.

Security guards at the mall rounded up three CHP members and hand them over to police. They were later detained, according to media.

Ulaş Yusuf Konyalı, CHP’s Sakarya youth branch head is reported to be among the detainees.