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An explosion killed three people and injured four others at a chemical plant in Jiaxing City, Zhejiang Province on Wednesday.
"The explosion happened at about 9:50 p.m. We heard two loud 'bangs' and rushed here immediately, when we got to the scene we saw two large fireballs."
Rescue workers said the accident occurred when a reaction kettle exploded and triggered a fire in the building.
All seven workers were trapped inside the workshop. Two were pronounced dead at the scene, and another died in the hospital.
Four others remain in the hospital.
The fire was extinguished that evening.
And an investigation into what caused the blaze is underway.