The Home Office has said it will investigate claims it employed a member of a radical Islamic group.
BBC's Newsnight programme claimed last night that a member of The Hizb-ut-Tahrir, a group Tony Blair once tried to ban, is employed at the Immigration and Nationality Directorate (IND) in Croydon.
It programme claimed the man works in the IND's Lunar House building on Wellesley Road.
Hizb-ut-Tahrir has been banned in a number of countries including France, Germany and the Netherlands.
The Prime Minister also said in August last year he wanted to see the group banned, but decided against it after police warned the organisation would then be forced underground; A spokesman for the Home Office would not confirm whether the individual named in the programme worked in the IND.
He said: "Any allegation is going to be investigated. We have asked the BBC to supply evidence to back up the claims.
He added: "All Home Office civil servants are expected to abide by Home Office rules governing their conduct and they are also subject to the civil service code."
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