An explosion from a refrigeration system on June 9 left three dead at a ConAgra Foods plant in Garner, N.C., reported the Garner News.

Out of the reportedly 300 workers inside the plant at the time of the explosion, more than 40 were taken to area hospitals and officials confirmed the bodies of Louis Junior Watson, 33, Rachel Mae Poston Pulley, 67, and Barbara McLean Spears, 43, after pulling them from the wreckage.

Several injuries sustained were from ammonia inhalation after the explosion broke a line and caused a leak. However, officials reported the EPA found the air quality to be suitable now.

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The Wake County Fire Marshal and Task Force, along with a ConAgra investigation team, began an investigation June 10, as they were unaware of what caused the explosion.

"Our goal is to make sure nothing like this ever happens again," said ConAgra CEO Gary Rodkins.