Media playback is unsupported on your device

Tracking British jihadists 'top priority' - Sir Peter Fahy

21 June 2014 Last updated at 13:01 BST

UK police are trying to get a recruitment video for jihadist group Isis - featuring a British student - taken off-line.

In the film, would-be medical student Nasser Muthana, 20, from Cardiff, urges others to fight in Syria and Iraq.

Sir Peter Fahy, counter-terrorism chief for the Association of Chief Police Officers, told the BBC that tracking British jihadists was the "top priority" for the police and security services.

Speaking on BBC Breakfast, he also urged people to come forward if they had suspicions that someone they knew had left the UK to fight.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.