A 2017 study on Jewish perspectives on antisemitism in Germany by Bielefeld University found that individuals and groups belonging to the extreme right and extreme left were equally represented as perpetrators of antisemitic harassment and assault, while the largest part of the attacks were committed by Muslim assailants. The study also found that 70% of the participants feared a rise in antisemitism due to immigration citing the antisemitic views of the refugees. Many of this started in 2015 when a large quantity of islamic refugees entered Germany.