The gloucestershire old spots, one of britains most famous pig breeds, from extinction. And coming up in the sport on bbc news chris latham wins a bronze for britain in the mens scratch race at the world track cycling championships, bringing gbs medal tally to two in two days. Good evening and welcome to the bbc news at six. The syrian president , bashar al assad, says claims that his armed forces were behind a chemical weapons attack on a rebel town last week are a 100 fabrication. Instead, he claimed america had worked Hand In Glove with Terrorist Groups to stage the attack as a pretext for american air strikes. And he questioned whether tv images of dead children were real. A warning that our report from James Robbins contains distressing images. Nine days ago, these pictures shocked the world. Children and babies struggling for breath after a suspected chemical weapons attack on the rebel held town of khan sheikhoun. Other pictures, to horror flick to broadcast, Should Fire Crews H