Here is something I found on the subject: (Note LTTE = "Liberation Tigers of Tamil Elam," the Sri Lankan terrorists):
This is what an account in the Jane's Land Forces has to say:
"Russia is currently the world leader in thermobaric weapons, and has already used them in action, for example to clearing Mujahideen from caves in Afghanistan and more recently Chechen guerrillas from buildings in Grozny. There were international protests over their use since a large number of civilians were affected in these instances.
"The Russian RPG – 7 (Note: this also is a weapon used by the LTTE) thermobaric warhead, fired from a manportable rocket-launcher, is said to produce effects comparable to the detonation of 2 kg of TNT, while the effects of the Russian RPO-A Shmel rocket-propelled incendiary / blast projectile are reportedly similar to those produced by a 122 mm howitzer projectile. (Note: 122 mm howitzers are used both by the Army and the Tiger guerrillas).