Conservatives claimed the immigration system was "completely out of control" yesterday following allegations of a new corruption racket at the Home Office's immigration HQ.
Officials launched an investigation into claims that an immigration officer has helped 200 asylum seekers remain in Britain for cash.
The official allegedly told an undercover journalist he charged up to £2,000 for helping people to get refugee status.
He also claimed he helped asylum seekers of other nationalities pretend they were Zimbabweans because of a current ban on deporting people back to Robert Mugabe's regime.
The immigration officer - named as Joseph Dzumbira, aged 35, from Southend, Essex - allegedly said he could provide fake Zimbabwean arrest warrants to support asylum seekers' claims that they would be in danger if they were returned.
He claimed he had already helped a "couple of hundred" asylum seekers for cash.
Lin Homer, director-general of the IND, said: "The last reported incident of corruption at the IND led to a sacking and is now under criminal investigation.
"The Home Office will not tolerate fraud and corruption from its staff.
"We take these allegations very seriously and will investigate immediately."