Converts to Islam are far more likely to be involved in terrorist incidents than those who were born into Muslim families: converts account for around a quarter of terrorist convictions in Britain since 9/11 yet they represent only 2-3% of the UK's Muslim population.

As the anniversary of the murder of Fusilier Lee Rigby by two Muslim converts approaches, the Today programme's Zubeida Malik investigates why new Muslims appear to be so vulnerable to the call of jihadi recruiters. She hears the stories of converts lured by extremists and talks to terrorism expert Professor Peter Neumann.

Producer: Anna Meisel.