Jihadist groups still pose a major threat to Europe, but 25 years after the 9/11 attacks a new menace driven by young people online is emerging Unlike 25 years ago — when extremists, mostly from Saudi Arabia, entered the United States and trained to become deadly pilots — the terror threat facing Europe today is mostly organised online Key points and original sources are listed below.

• Jihadist groups still pose a major threat to Europe, but 25 years after the 9/11 attacks a new menace driven by young people online is emergingS1

• Unlike 25 years ago — when extremists, mostly from Saudi Arabia, entered the United States and trained to become deadly pilots — the terror threat facing Europe today is mostly organised onlineS2