Media playback is unsupported on your device

UK extremists 'skip bail to fight in Syria'

18 June 2014 Last updated at 22:43 BST

Two known extremists who were under criminal investigation have fled the UK for Syria, the BBC can reveal.

Abu Aziz from Luton, a supporter of ISIS, the extremist group leading the insurgency in Iraq, was convicted in his absence on Wednesday for a violent attack on a member of the public in London.

Junaid Hussain of Birmingham left the UK while on bail pending investigation for violent disorder.

The revelation comes as Prime Minister David Cameron warned of the danger to the UK of radicalised fighters returning from Iraq and Syria.

The BBC's Home Affairs correspondent Matt Prodger reports.