UK border officials failed to pursue more than 3,000 leads on missing asylum seekers, an inspector has found.
Independent Chief Inspector of Borders and Immigration John Vine said no action was taken by the now defunct UK Border Agency (UKBA) to locate positive hits, which were returned when matching asylum seeker details on the Police National Computer (PNC).
Border staff said a decision was taken not to write to applicants in relation to PNC checks because the information was deemed unreliable.
The inspector added that he was "not provided with any rationale to support this view".
He said that if the PNC checks been followed up, it might have resulted in new information coming to light that would have helped the UKBA to locate individuals.
More top news
It'll become increasing cloudy tonight, with outbreaks of rain in the northwest
Six months on from the referendum, Political Editor Robert Peston takes a road trip to find out what people feel about Brexit now.
Donald Trump has been criticised for appointing a man who once sued the Environmental Protection Agency to be its new boss.