Turkish police detained a law student at Ankara University, identified with his first name Dogan, for wearing “hero” T-shirt during an exam on Friday.

According to Ihlas News Agency, Dogan put on a T-Shirt bearing the word “hero” on him before taking an exam as part of his commercial law course on Friday.

The exam invigilator noticed the T-shirt and reported him to the university security which later called the police to the campus. Police rounded up Dogan while passersby were heard swearing at him.

The hero T-shirts have become a contentious issue when Gökhan Güçlü, one of the suspects on trial for an assassination attempt against President Recep Tayyip Erdoğan on the night of the coup, was thrown out of the courtroom last Thursday for wearing a T-shirt bearing the word “hero” because it caused tension between the parties during the hearing.

Since then, Turkish police have rounded up 14 people including four university students, two factor workers and a waiter for wearing T-shirts bearing the word “hero” in Eskişehir, Aydın, Elazığ, Antalya, Sakarya, Canakkale, Ankara and Erzurum provinces.

President Recep Tayyip Erdogan said people detained over coup charges should wear a single outfit, like in Guantanamo.

In the meantime, the textile firm that manufactures the hero T-shirts stopped production and the T-shirts were withdrawn from sale in stores and online.