Wired gives some insight to global terror in their look at Thermobaric Slaughter in Sri Lanka.

How realistic are the allegations that the LTTE have employed thermobarics? The FBI calls the LTTE “among the most dangerous and deadly extremist outfit in the world,” and they have been accused of many attacks on civilians. They invented the suicide belt, and their Black Tiger suicide units have carried out more suicide bombings than Hamas, Islamic Jihad and al-Qaeda put together. (Incidentally, the LTTE are largely Hindu and have been accused of carrying out anti-Muslim campaigns.)

They don’t give numbers, but the more important question is whether this group is an indicator of where tactics will be going or a training ground with predictable release cycles.