Authorities in Greece say three migrants have been hospitalized with injuries after violence broke out overnight at a detention camp on the island of Lesbos.

The clashes between migrant groups occurred early Thursday and also resulted in a fire that gutted a converted freight container used as trailer home, police said.

It was the latest violence at the Moria camp on the Greek island, where more than 2,500 are held in detention following a March agreement between the European Union and Turkey to deport migrants and refugees.

Deportations have been held up by delays in the asylum screening process — triggering frequent unrest at camps on Lesbos and the nearby island of Chios.