LONDON — Within hours of a stabbing attack in northwest England that killed three young girls and wounded several more children, a false name of a supposed suspect was circulating on social media. Hours after that, violent protesters were clashing with police outside a nearby mosque. Police say the name was fake, as were rumors that the 17-year-old suspect was an asylum-seeker who had recently arrived in Britain. Detectives say the suspect charged Thursday with murder and attempted murder was born in the U.K., and British media including the BBC have reported that his parents are from Rwanda. That information didmore