Two students from Turkey were arrested in Poland for using a Nazi salute on a group of Israeli students visiting the Majdanek concentration camp.

The Turkish students were taken into custody in Poland. The incident last week was reported in the Turkish media on Friday, according to Today’s Zaman.

The students reportedly made the Nazi salute and said “Heil Hitler” when they met a group of students from Israel. The Israeli group filed an official complaint, leading to the detention of the two Turkish students, who said the action was a joke, according to Zaman.

If they are found guilty of the charges of promoting fascist propaganda, the students could face up to three years in prison.