At least 35 people have been killed in a car attack in southern China, believed to be the deadliest known act of public violence in the country in decades. Police say a man crashed his car into a stadium in Zhuhai on Monday where he ran down groups of people exercising on the sports track.

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.

Reports say at least 20 were injured in the incident in Zhuhai, which is hosting a high-profile military airshow.

Video showed wounded people after a car rammed into a crowd and killed at least 35 in Zhuhai, China, on Nov. 12. This video has no sound.

People in a southern Chinese city were paying respects Wednesday to 35 of its residents killed by a driver who rammed his vehicle into a sports complex, mowing down people as they were exercising. Police have offered little information about the 62-year-old attacker beyond saying the man,