A yellow smoke was seen coming out of a warehouse in the Chinese city of Xingtai in the Hebei province after a leak of acidic substances, CCTV reported on Saturday.
The state TV added that the leak at the warehouse owned by a company that makes children's products has been brought under control by firefighters.
The incident did not result in any casualties and the authorities insisted the smoke is not toxic to humans. The cause of the leak is currently under investigation.