MOSCOW - A rebel-linked Web site said Friday that Chechen warlord Shamil Basayev had claimed responsibility for the power outage that plunged Moscow into chaos two days earlier. [end] "Our sabotage units delivered a major blow to one of the most important life-support systems of the Russian empire," the Kavkazcenter site quoted Basayev as saying in an e-mail. [end] Russian officials have blamed worn-out equipment for Wednesday's power failure, which began with an explosion and fire at a 40-year-old substation. The Federal Security Service declined comment on Friday's claim and telephone calls to the Industry and Energy Ministry were not...