"They suffered splinter injuries after the top portion of the ammonia scrubber exploded during maintenance work in the Coke Plant of Tata Steel," A K Mishra, Chief Inspector of Factories, Government of Jharkhand, said.
All the injured were admitted to hospital, he said.
Earlier, Amresh Sinha, Head of Corporate Communication of Tata Steel, had said that 12 people were injured in the explosion.