At least 18 people were detained on Saturday after police intervened into a group of military academy students and their families during a scheduled march in Turkey’s capital.

Dozens of students who were removed from military academies after the government shuttered them in its post-coup crackdown marched along with their family members to the Anitkabir, the monumental tomb of Mustafa Kemal Ataturk, the founder of the modern Turkey, on Feb 24.

The banners announcing the event on social media highlighted that “all required permissions were taken in advance.” However, Ankara police intervened into the group and detained 18 people, among them the students and family members.

“My son has been under arrest for 20 months,” woman was heard yelling in a video clipping, reportedly recorded following the intervention.