CHIOS – One person was arrested and 11 were brought in for identification at a police station on Chios island, following incidents begun when residents protesting the construction of migrant facilities stormed a hotel and clashed with riot police staying there.

According to Hellenic Police, the individual arrested is a 27-year-old man, while another has been identified as also responsible for the incident and is being sought. Nine police members were injured.

Dozens of policemen deployed to two eastern Greek islands to quell protests over planned new migrant detention centers have been injured during two days of clashes with local residents, authorities said Wednesday.

Greece’s Aegean Sea islands are a main entry point for migrants seeking better lives in the European Union. Managing the flow of people — and growing discontent among Greek islanders —has become a challenge for the center-right government in Athens.

Local authorities declared a 24-hour strike and staged protest rallies on the islands of Lesbos and Chios to protest government plans for new detention centers to replace existing ramshackle, overcrowded camps.

Police said 43 officers were hurt on Lesbos, which sees the most arrivals as migrants cross the sea from nearby Turkey. Another 11 officers had injuries on Chios, where an angry mob burst into a hotel used by riot police, beat up officers in their rooms and threw out their belongings..

Twelve people were arrested on suspicion of involvement in the attack, police said. Police gave no information on injuries among protesters.

Lesbos, and to a lesser extent Chios, annually receive tens of thousands of people fleeing war or poverty in the Middle East, Asia and Africa. The migrants cross from the nearby Turkish coast in small, unseaworthy boats provided by smuggling gangs.

Under a 2016 deal between the European Union and Turkey, migrants reaching the islands must stay there until their asylum requests are processed — and if these are rejected they must be taken back by Turkey.

But delays in the asylum process, coupled with increased migrant flows, placed massive strains on the system and led to a sharp deterioration of living conditions in existing camps whose populations burgeoned — despite Greek authorities moving people judged as vulnerable to the mainland. Furthermore, returns to Turkey have been negligible.

Lesbos, with a permanent population of 85,000, now has more than 21,000 migrants according to the latest official data available Wednesday.

Island residents and local authorities say they want all asylum seekers to be moved to the mainland. They oppose construction of the new facilities and want the old ones shut down.

The government has vowed to go ahead with the planned new facilities, and deployed riot police with crowd control vehicles from Athens late Monday to prevent protesters from stopping construction work.

Nearly 60,000 migrants and refugees arrived on Greek islands last year, almost double the number recorded in 2018, according to the U.N. refugee agency.