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He said he worked for years as a day labourer, but gained citizenship and has four children who graduated from college.

Typically, their gatherings include dozens of day labourers, many of whom are undocumented immigrants, seeking work from shoppers or contractors.

The man, who has worked as a day labourer in Paju and other cities, told police that he had accumulated several unpaid fines, according to South Korean newspaper The Dong-A Ilbo.

The permits were limited to day labourers, businesspeople, medical patients and their companions, and aid workers.

Most of the band took up jobs as day labourers and casual workers to make ends meet and the songs they perform, composed in Khartoum, are full of anguish and longing for home.