Suspected foreign war criminals 'cannot be tried in UK'
13 February 2014 Last updated at 09:47 GMT
Forty-nine people suspected of genocide, torture or other serious crimes abroad are living in the UK despite being priority cases for deportation, figures reveal.
Because courts have ruled they could be harmed or killed if sent to their home country, the suspects have been given "restricted" leave to stay in the UK.
Sir Geoffrey Nice QC, who has previously led the prosecution of Slobodon Milosevic, explained to the Today programme's Justin Webb why the suspects cannot be tried in a British court, describing the situation as "very troubling".
First broadcast on BBC Radio 4's Today programme on Thursday 13 February.