"President Obama and Prime Minister David Cameron of Britain expressed concern about “increasing signs” of “a significant chemical weapons attack carried out by the Syrian regime against its own people,” a British government statement said. The two leaders said that “significant use of chemical weapons would merit a serious response from the international community,” the statement added."

http://www.nytimes.com/2013/08/25/world/middleeast/syria-updates.html?hp&_r=0