People posting on social media said they felt the shock of the explosion, but the damage did not appear to extend beyond the plant.
China, with the world’s second-largest economy, suffers deadly industrial accidents on a regular basis. The central government has pledged stronger safety measures ever since an explosion in 2015 at a chemical warehouse in the northern port city of Tianjin killed 173 people, most of them firefighters and police officers.
In that case, a number of local officials were accused of taking bribes to ignore safety violations.