text: Russia: Accidental Blast Led to Siege End MOSCOW - The militants who raided a school in southern Russia last week were led by a man dubbed the Colonel, who enforced obedience by killing three fellow attackers - two by detonating the explosives they had strapped to their bodies.    Two days later, the attackers were moving the explosives they rigged around the gym where hundreds of hostages were held, and a bomb went off accidentally...