A fire broke out in a women's ward of a Moscow drug treatment hospital early Saturday, killing 45 women trapped by barred windows and a locked gate, officials said. Russia's chief fire inspector, Yuri Nenashev, said he was "90 percent certain" that the fire was caused by arson. But Moscow city prosecutor Yuri Syomin said investigators were looking into other possibilities, the ITAR-Tass news agency reported.