Turkish authorities arrested a group of people for allegedly seeking to enter Greece illegally Thursday, and accused some of them of belonging to the outlawed Gulen movement. 

Turkish border police arrested five people in Meric near the Greek border. The police said four of them belonged to the Gulen movement, according to a tweet from the Turkish Defense Ministry. 

Fethullah Gulen is a US-based, Turkish Islamic scholar who leads the eponymous movement. He has considerable support in Turkey. President Recep Tayyip Erdogan blamed Gulen’s supporters for the 2016 coup attempt, and has been cracking down heavily on the group ever since. In April, police arrested hundreds of military personnel for alleged Gulenist ties. 

Gulen supporters and other Turkish citizens who have been persecuted since the coup have tried to flee to neighboring Greece before, and there was an increase in illegal journeys to the European country post-2016. The phenomenon is continuing. Turkish police also arrested an alleged Gulen supporter for trying to flee to Greece on Monday.