An Irish man has spent five months in US Immigration and Customs Enforcement detention and faces deportation despite having a valid work permit and no criminal record.

Seamus Culleton was a “model immigrant” who had become the victim of a capricious and inept system, said his lawyer, Ogor Winnie Okoye.

After being held in ICE facilities near Boston and in Buffalo, New York, he was flown to a facility in El Paso, Texas, where he is sharing a cell with more than 70 men. Culleton said the detention centre was cold, damp and squalid and there were fights over insufficient food – “like a concentration camp, absolute hell”, he told the Irish Times, which first reported the story on Monday.