The director of UNHCR, the United Nations refugee agency in Greece, called Monday for the creation of more special centre for unaccompanied child immigrants and refugees, reported the dpa. "The arrival of an increasing number of unaccompanied minors in Greece is a major problem," George Tsarbopoulos, the director of UNHCR in Greece told the German Press Agency dpa in a telephone interview. Tsarbopoulos, who recently paid a two-day visit to the eastern Aegean island of Lesbos, called for the creation of more reception centers similar to the Agiasos centre for unaccompanied minors currently in operation on the island. "The minors should not be kept in detention but referred to adequate reception facilities responding to their needs. These days the Agiasos centre received more than 150 children while it was only created to house 100," he said.