The blast struck at around 2:30 p.m. outside the city of Kaili in the poor southern province of Guizhou, the official People’s Daily newspaper and Xinhua News Agency said. While the cause of the explosion officially remains under investigation, police believe it was set deliberately and are treating the incident as a crime, People’s Daily said.
Gambling is illegal in China and such operations are mostly connected to organized crime. Guns are strictly controlled, making homemade bombs the weapon of choice. [Source]