In this Friday, Jan. 29, 2021 file photo, Hall County firefighters enter a back door at Foundation Food Group in Gainesville, Ga., the day after six people were killed following a liquid nitrogen leak at the plant. Firefighters were called to the plant again on Thursday, March 11 after concerns over a possible ammonia leak, but firefighters and plant officials say no harmful levels of ammonia were found. Autopsy results released Friday, March 12 show all six workers killed in January died of asphyxiation because of liquid nitrogen exposure. (Scott Rogers/The Times via AP, File)
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