A series of huge explosions shook the warehouse at Tianjin Port International Logistics Center in the northern Chinese city of Tianjin late Wednesday, killing at least 44 people and injuring hundreds more, according to officials and state media. The People's Daily newspaper said at least 520 people were injured, more than 60 of them seriously. As of Thursday morning, an unknown number of people remained unaccounted for in the wreckage. The initial explosion erupted at a warehouse for a logistics company in an industrial area of the port city, according to Tianjin police. The company was identified as Tianjin Dongjiang Port Rui Hai International Logistics Co. Ltd. The second explosion was so powerful that I felt the entire 16-floor-building was shaking, says an eye witness.