Russian teargas grenade 

A device used by the russian special forces in hostages situations which ends up killing 90 % of the hostages along with every terrorists. This teargas causes also the hostages's families to cry for many days.

Moscow theater hostage crisis

Good exemple of a badly done Russian Teargas Grenade (only 1/5 of the hostages died)

All of the 33 terrorists were killed, along with at least 130 (out of 850) of the hostages, with no official OSNAZ (Russian special force) casualties.

Russian teargas grenade by Bobby bobber February 10, 2007