Abdel Hamid al-Youssef said 25 members of his family, including his wife and infant twins, were killed when poison gas was dropped on their town in Syria in 2017, in an attack a U.N.-backed inquiry concluded was launched by the Syrian state.
"In seconds, everything was erased. Life was completely erased," Youssef, 33, said of the sarin attack that struck the town of Khan Sheikhoun, one of scores of times chemical weapons have reportedly been used in the country's 11-year-old war.
