Seven people were injured after an explosion at a chemical plant in East Rutherford Tuesday afternoon, police said.
The explosion happened as workers were mixing chemicals inside the Sun Chemical plant, according to police.
East Rutherford Fire Department Assistant Chief John Giancaspro said the workers were mixing carbon and vegetable oil used in newspaper ink for the New York Times, and they are unsure why it exploded.
Sun Chemical is the world's largest producer of printing inks and pigments, according to its website.
A law enforcement source tells NBC 4 New York that the fire and chemicals spread to other workers after a fire extinguisher was used to put out the flames from the mixing vat. As the worker used the extinguisher, the contamination was spread from the original two workers to five more.
Five workers are in fair condition at Hackensack University Medical Center and two others were transported to the burn unit at St. Barnabas.
The explosion and subsequent fire was contained inside the plant, and an evacuation of homes from the nearby residential neighborhood wasn't necessary, Bergen County Police Chief Brian Higgins said.
Higgins also said the county Hazmat team responded to decontaminate anyone exposed, including other workers and firefighters.