Police have fired tear gas and rubber bullets at protesters on the Greek island of Lesbos over plans to build new migrant camps.
Images from the island show protesters hurling objects at officers and a building site for one of the centres.
Dozens of people, including protesters and police officers, were injured. Greek Prime Minister Kyriakos Mitsotakis has called for calm.
Demonstrations also took place on the islands of Chios and Samos.