NEW : The death toll rises to 40 , the Novosti says . NEW : More than 120 people are hospitalized . Moscow ( CNN ) -- Three metro train cars derailed in a tunnel during rush hour , ITAR - TV says . The cause of the derailment is not clear ; officials have ruled out sabotage .
NEW : The death toll rises to 40 , the Novosti says . NEW : More than 120 people are hospitalized . Three metro train cars derailed in a tunnel during rush hour , ITAR - TV says . The cause of the derailment is not clear ; officials have ruled out sabotage .