London: A study carried out by the British think tank Migrationwatch has claimed that over a million illegal immigrants are living in the country.
The Sun quoted the study as saying that this figure is double of the previous estimate, and added that it equals the population of Birmingham.
The study warned that if the Gordon Brown government approves the proposed amnesties, this number could double when spouses and dependants are allowed in.
Previous studies by the Home Office and London School of Economics estimated that 618,000 lived in Britain.
Migrationwatch Chairman Sir Andrew Green said "a serious attempt" is needed to resolve the situation, which could take years.