NEW : An opposition group reports 72 deaths ; state news says `` terrorists '' targeted . In addition to hexogen , the Russian experts found the nerve agent sarin and another such chemical in its shell and soil samples . ' NEW : Syrian official says `` those who lead the aggression '' will pay the price . NEW : The UN Security Council votes unanimously to condemn Syria for its use of chemical weapons against civilians and calls on all parties in Syria to comply with their obligations under international law. Russian leader says the evidence for a U.N.-backed strike should be undeniable .
NEW : An opposition group reports 72 deaths ; state news says `` terrorists '' targeted . NEW : Syrian official says `` those who lead the aggression '' will pay the price . NEW : The UN Security Council votes unanimously to condemn Syria for its use of chemical weapons against civilians and calls on all parties in Syria to comply with their obligations under international law. Russian leader says the evidence for a U.N.-backed strike should be undeniable .