A car attack that killed 35 people in China has sparked questions about a recent spate of public violence, as officials continue to censor discussion on the incident. On social media, many are discussing the social phenomenon of "taking revenge on society",

Officials in southern China ramped up security on Wednesday at the site of one of the country's deadliest mass-casualty events in years, snuffing out makeshift memorials to the 35 people killed when a man drove a car into a crowd at a sports complex.