An explosion at a fireworks factory in southern China killed 12 people and injured 33 others, the local government said…Two people were also missing following Monday's blast, which shook Nanyang Export Fireworks Factory, the city of Liling in Hunan province said…It did not say what caused the explosion but said it was a work safety incident. The factory is properly licensed, it said. Workplace accidents are common in China because of lax enforcement of safety regulations, although safety standards are improving…