French navy soldiers prepare to fly French Rafale fighter aircraft off the aircraft carrier Charles de Gaulle at sea off the coast of Toulon, southern France, on January 13, 2015
Media playback is unsupported on your device
Video

Leaders gather to discuss efforts to tackle IS threat

Senior officials from 21 countries are gathering in London to discuss efforts to tackle the jihadist militant group, Islamic State (IS), in Syria and Iraq.

Authorities across the globe are concerned about the thousands who have travelled to fight in Syria and Iraq.

Tracking them requires greater international cooperation and ministers hope to set out plans to halt the flow of recruits and money to IS.

Diplomatic Correspondent James Robbins reports.

Go to next video: In 60 seconds: What does IS want?