There have been international reactions over a chemical attack on a rebel-held town in Syria’s eastern Ghouta, linked with deaths of dozens of people. Washington and London said the reports – if confirmed – would demand an immediate international response. A joint statement by the medical relief organization Syrian American Medical Society (SAMS) and the civil defense service, which operates in rebel-held areas, said 49 people had died in the attack late on Saturday. Others put the toll at 150 or more. The Russian-backed Syrian state denied government forces had launched any chemical attack as the reports began circulating and…