The explosion happened just before 9 p.m. on Saturday in the city of Zibo in Shandong province, the Xinhua News Agency said.
No fatalities were reported, Xinhua said, citing local police, although nine people were injured and taken to hospital.
The warehouse involved in the explosion reportedly stored a chemical called Adiponitriel, a colorless liquid used in the manufacture of nylon, according to the Beijing Times.
Meanwhile, the Chinese authorities yesterday came under fire for using caged rabbits, chickens and pigeons to test the safety conditions in Tianjin, amid concerns about lingering toxic chemicals in the air and water, after massive explosions rocked the port city on August 12.
A total of 150 firefighters from the city’s fire brigade are battling the blaze.
Other reports said windows shattered at the factory and the vibrations were felt about two kilometres far from the factory.
About 4,460 soldiers and police officers are working to remove the unsafe chemicals and clean the area.
The cabinet has promised a rigorous and thorough probe into the deadly blasts, the report said.
They also sparked a nationwide directive cracking down on the storage of chemicals.
One of the new fires on the site was reported to be in the depot where 3,000 cars were burnt. The fire was brought under the control, with the officials investigating the cause of the incident. The blast’s after-effects posed no danger to the public and cyanide levels in samples from rivers and offshore were no cause for alarm, authorities confirmed.