paris investigators friday reconstruct second train plow school bus level cross southern france kill least five children incident prime minister describe horrific collision thursday afternoon rip bus apart authorities work night identify first victims official death toll come source close investigation early say six youngsters lose live incident stun small community millas near perpignan hospitals appeal blood help treat seven others remain critical condition government spokesman benjamin griveaux say cause crash still unclear occur cross consider dangerous investigators look whether automatic barriers light level cross malfunction take blood sample driver toxicology study french media report driver 49-year-old woman injure collision describe lucid manager bus company interview bfm tv bus well maintain add train carry 25 passengers travel 80 kmh regulatory speed section track collision occur national sncf railway say french investigators piece together deadly train bus collision