The UN Security Council listened Thursday to emotional firsthand accounts from Syrian doctors on the use of chemical weapons and pledged to take action against those behind the attacks. The closed-door meeting left many council members in tears, said U.S. Ambassador Samantha Power. The U.S., Britain and France have accused President Bashar al-Assad’s government of using chlorine gas against civilians, but Russia argues there is no proof that the regime is responsible. The doctors said the 15 envoys agreed to further investigate and to take action against those responsible. An OPCW report in January found “with a high degree of confidence” that chlorine gas attacks had occurred on three Syrian villages last year.