Reports of Monday’s attack were already being restricted online on Tuesday – with several videos taken by witnesses at the scene removed from Chinese social media platforms.
But some footage still circulating online showed dozens of people lying on the ground and being attended to by paramedics and bystanders.
In China it is common for censors to quickly take down social media videos which are linked to high-profile incidences of crime.
BBC journalists reporting from the stadium at Zhuhai on Tuesday were also harassed and told to stop filming.
China has seen a spate of violent attacks on members of the public in recent months that have been reported in local media to varying degrees.
In October, a knife attack at a top school in Beijing injured five people, while in September, a man went on astabbing spree at a supermarket in Shanghai, killing three people and injuring several others.
Also in September, a 10 year old Japanese student died a day after he was stabbed near his school in southern China.
Following Monday’s car attack, Japan’s embassy warned its nationals living in the country to avoid speaking Japanese loudly in public.
The incident in Zhuhai has also taken place during heightened security in the city, which is hosting a major military airshow this week. The attack on Monday night took place 40km (24 miles) from where the high-profile Airshow China kicked off on Tuesday.
China is showcasing its newest warplanes and attack drones at the show, which top Russian defence official and former defence minister Sergei Shoigu is expected to attend.
Several entrances and exits to the sports centre were closed during the airshow to facilitate “control”, the centre’s management said on Tuesday.
[BBC]