WASHINGTON -- For months, officials from intelligence services from around the world have quietly met and discussed growing concerns that a new strain of terrorist would be nearly impossible to stop from launching attacks.
They feared that terrorist hybrids -- lone wolves and small cells of violent extremists who swear allegiance to organizations such as al-Qaida while operating on their own -- would begin popping up. The explosion of social-media propaganda from terror organizations is attracting an increasing number of people to join them.
