A total of 561 undocumented foreigners were detained by the Immigration Department following an integrated operation at the Baiduri Apartments at Bandar Tasik Kesuma, Beranang, Selangor.br br Immigration Department director-general Datuk Ruslin Jusoh said those detained were from Bangladesh, Myanmar, Nepal, Indonesia, Pakistan, Sri Lanka, India, Cambodia, Sierra Leone and Cameroon aged between three months and 55.