NEW : The death toll rises to 22 , RIA Novosti says . NEW : More than 120 people are hospitalized . Their efforts were made more difficult by the depth of Moscow 's metro lines , on which roughly 11 million people travel daily . Comment: The cause of the derailment is not clear ; officials have ruled out terrorism .
NEW : The death toll rises to 22 , RIA Novosti says . NEW : More than 120 people are hospitalized . Comment: The cause of the derailment is not clear ; officials have ruled out terrorism .