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Jan 7, 2016 8:28 PM

UPDATE: 4 critically injured in chemical explosion at Dow Chemical Plant

NORTH ANDOVER, Mass. - Four employees of Dow Chemical Co. were critically injured in a chemical explosion Thursday afternoon. All of the victims were transported to Lawrence General Hospital before three of them were taken by medical helicopter to Boston area hospitals.

Massachusetts State Fire Marshal Stephen Coan said it's too early to determine an exact cause of the explosion, but they believe it occurred when a chemical reacted with water.

According to Lawrence General Hospital, the victims suffered from shrapnel wounds and burns. All were able to walk out of the building on their own.

A worker was killed in a chemical explosion at this same plant back in 2013, but authorities do not believe they are connected.

Local, state, and federal investigators are working together in the investigation.

According to firefighters, the chemical in question is used LED lights and electronics.

A Dow spokesperson released a statement, saying in part, "There are no imminent community risks at this time. Our thoughts and prayers are with the families, friends and colleagues during this extremely difficult time. An investigation is underway to determine the cause of the incident."

As of late Thursday evening there was no update on the conditions of those injured.

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