FILE - In this Aug. 2, 2017 file photo, emergency workers respond to an explosion at Minnehaha Academy in Minneapolis. Federal investigators say a pipefitting crew lacked proper training when they moved a gas meter just before a Minneapolis school explosion that killed two people in 2017. The National Transportation Safety Board released its report Monday, Dec. 2, 2019 on the explosion at Minnehaha Academy. (Aaron Lavinsky/Star Tribune via AP, File)
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