The local authorities say this is being encouraged by elements across the border in Pakistan.

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The plan includes four key elements: stronger border security, creation of forgery-resistant proof-of-citizenship documents, fairer legal immigration for desirable candidates, and a "tough love" path to citizenship for those already in the United States.

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"Mr Rana's claim was turned down by the UK Border Agency and then by an appeal court where a judge found that elements of his case were inconsistent and that he had failed to show that he faces persecution in Pakistan, " said the spokesman.

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