The British authorities have lost track of a population of asylum seekers the size of Cambridge, according to a critical report by MPs.
The number of "lost" asylum seeker cases has tripled in six months from 40,500 in March to 124,000 in September.
When the UK Border Agency loses track of an applicant, they reportedly "dump" the cases in what is called a "controlled archive."
But the MPs on the Commons Home Affairs Select Committee said the controlled archive was "a bureaucratic term which hides the true nature of the Government department's activity and is designed to deflect attention away from it."
They also said it would more appropriately be named "an archive of lost applicants."
Keith Vaz, the committee's chairman, said: "The UK Border Agency is still not providing the efficient, effective service that Parliament expects.
"The Prime Minister himself recently called for members of the public to provide intelligence on immigrants.
He added: "There is little point in encouraging people to do this if the border agency continues to fail to manage the intelligence it receives or to keep track of those who apply to stay."
The archive includes around 98,000 asylum seekers who cannot be found and the agency has no idea whether they are even still in the UK.
It also features around 26,000 migrants involving those who have overstayed their visas or who have been refused an extension of leave, such as students.