A purple mushroom cloud filled the sky after a bio lab blast killed four people and injured four others.
Residents said the explosion shook their doors and windows up to two miles from the blast site.
Other stunned locals filmed the large purple cloud from their homes.
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The explosion reportedly took place at the offices of Jiangsu Huili Biological Technology in Taizhou City located south of Shanghai in China.
It is believed the company is engaged in the research and development of industrial biotechnology.
The emergency services arrived quickly on the scene to deal with the situation on Tuesday (11 Mar) afternoon.
The death toll was confirmed by the Gaogang District Emergency Management Bureau.
The blast involved iodine due to the colour of the mushroom cloud, it is understood.
Residents in the surrounding area said they did not detect any strange odours in the air after the blast.
The authorities also stated that the accident did not have any secondary impact on the surrounding environment, as reported by Need To Know.
The investigation into the explosion is ongoing.
