The Associated Press is reporting that heat caused a steel container full of liquid ammonia on the back of a truck to explode Tuesday in Nanhui District, sending 60 people to the hospital. By late Tuesday, however, only three people remained hospitalized. While the AP says 100 people were injured by the blast, Shanghai Daily puts the number at 65 — and says the injuries were caused by three separate explosions, the worst being the one in Nanhui that occured at 12:30 p.m. The paper also said a talcum powder container exploded at Shanghai Xiangmao Co., Ltd., a Jinshan District factory with a “troubled history.” Four workers were burned, some on as much as 30 percent of their body. A similar explosion at the plant injured 10 on June 20. The day’s other accident occured at 6 a.m. at the intersection of Wuyuan Lu and Wukang Lu. A gas pipe explosion sent two people to the hospital.
Chinese web portal 163.com has more detailed account of the Nanhui explosion (in Chinese) with photos.