The rescue operation had become a recovery operation by Tuesday afternoon as emergency workers sought to free the remaining bodies from within the mangled train cars . NEW : The death toll rises to Three , ITAR-Tass says . NEW : 22 people are hospitalized . More than 120 metro train cars derailed in a tunnel during rush hour , RIA Novosti says . The cause of the derailment is not clear ; officials have ruled out terrorism .
NEW : The death toll rises to Three , ITAR-Tass says . NEW : 22 people are hospitalized . More than 120 metro train cars derailed in a tunnel during rush hour , RIA Novosti says . The cause of the derailment is not clear ; officials have ruled out terrorism .