From [1] Reuters

Chechen warlord Shamil Basayev claimed responsibility on Friday for the Russian school siege in which more than 320 hostages were killed, half of them children, and threatened further attacks by any means he saw fit.

"We are not bound by any circumstances, or to anybody, and we will continue to fight as is convenient and advantageous to us, and by our rules," he said in an unrepentant statement published on a rebel Web site.