Turkish police deployed tear gas to disperse tens of university students in İstanbul who were marching to commemorate the victims of a terrorist attack that claimed the lives of 102 people near Ankara’s main train station on Oct. 10, 2015.

According to a Twitter account run by a group of students from İstanbul University, at least 40 students were detained by the police. A video footage posted on Twitter by the same twitter account shows the moment police officers in plain clothes attack the protestors and threat those who record the incident.

In a related devolopment, the Cumhuriyet daily reported that ten protestors were detained by Ankara police while protesting the Turkish government in Ankara on Tuesday.

The Associated Press reported on Tuesday that police only allowed relatives of the attack’s victims, civil society representatives and politicians on the scene and intervened when crowds intending to commemorate the attack approached the station.

On Oct. 10, 2015, two suicide bombers targeted a peace rally outside the train station. The bombers reportedly belonged to a Turkish cell of the Islamic State in Iraq and the Levant (ISIL).