Middleton public safety officials are saying there is no reason for concern The site is located just over the town line from Russell Street in Peabody.
Air quality tests have been performed and there is no issue; however, they are also asking nearby residents to stay indoors and keep doors and windows closed.
Health officials are monitoring the nearby Ipswich River to see if any chemicals were released into the riverway, said Middleton Fire Chief Frank Twiss.
The cause of the explosion is under investigation. It is uncertain what chemicals were involved, said Twiss.
Middleton firefighters responded to a scene at 7:39 p.m. after reports of an explosion. People all over the North Shore reported hearing the explosion and some likened it to hearing the Danversport explosion in 2006.
Firefighters found a “heavy volume of fire” when they arrived. Ultimately, the department struck four alarms to bring more area fire departments to the scene. Lynnfield, Peabody, Salem, Beverly, North Reading, Danvers and North Andover all sent firefighters and equipment Sunday night.
The fire was knocked down in 40-50 minutes.
Four people were injured in the explosion and were taken to Beverly Hospital where a decontamination staging area was set up. No injuries are life threatening, said Twiss.
A tier 3 hazmat response was initiated, which is between 30 and 45 technicians. They checked the scene Sunday night.
There were no evacuation of area homes and no structural damage to those homes reported, according to Twiss.
Even so, Middleton Police Chief James DiGianvittorio is asking people to stay indoors and keep their windows and doors shut.
Coincidentally, Middleton firefighters held hazmat training at the plant in May, according to Twiss.
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