World ‌An explosion at a fireworks factory in China's Hunan ​province has killed ​21 people and injured 61, prompting President ​Xi Jinping to call for ‌a thorough investigation, state media reported on Tuesday. Nearly 500 emergency workers were deployed to the scene Listen to this article Estimated 2 minutes The audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results. Firefighters work to extinguish a fire following a blast at a fireworks manufacturing factory in Changsha, Hunan province, China, on May 5. (cnsphoto/Reuters) An explosion at a fireworks plant in a central Chinese province killed at least 21 people and injured 61 others, state media reported Tuesday. China's official news agency Xinhua said the blast occurred around 4:40 p.m. local time Monday at a fireworks plant in Changsha city in Hunan province.…