At least 11 students from Istanbul’s prestigious Bogazici University remain in police custody for airing opposition to Turkey’s ongoing military operations against Kurdish militants in northern Syria amid a broadening crackdown on anti-war sentiments.

The first wave of detentions took place last week after the students unfurled banners criticizing fellow students supporting soldiers who fell during Turkey’s ongoing Operation Olive Branch in Syria’s heavily Kurdish Afrin region. The latter had set up a stand and handed out Turkish sweets they called “Afrin delights.” It is a Turkish tradition to serve sweets following a loved one’s death. The anti-war group allegedly attacked them prompting police intervention.

Turkey’s President Recep Tayyip Erdogan angrily denounced the students, calling them terrorists and vowing to establish their identities from camera footage of the incident. “We will catch those marginals by the ear and hurl them to the ground,” he snarled during an address to his ruling Justice and Development Party’s Beyoglu branch in Istanbul.

He also took aim at Bogazici professors, saying if they had collaborated in the protest, “we will do what is necessary to them too. … We will not cede ground to those who unleash terror on campus lawns.”