In the past two decades, Saudi Arabia realised that it was becoming a breeding-ground for young terrorists. 15 of the 19 hijackers involved in the 9/11 attacks were Saudi citizens - and since then terror groups have become active on home soil. The Saudis have had to think of creative ways to defuse the threat. UN 21st Century brings you their story.

In the past two decades, Saudi Arabia realised that it was becoming a breeding-ground for young terrorists. 15 of the 19 hijackers involved in the 9/11 attacks were Saudi citizens - and since then terror groups have become active on home soil. The Saudis have had to think of creative ways to defuse the threat. UN 21st Century brings you their story.