A chemical tank at a Washington state paper mill fails in late May, expelling caustic liquid that damages parts of a building in Longview. Investigators say the same tank had been deemed unfit for service before the failure, according to an update from the U.S. Chemical Safety Board.

The federal agency’s findings reference an inspection contractor that identified problems with the tank about 10 months earlier, leaving the equipment in a condition investigators now say was unsafe. The Chemical Safety Board is still assessing what caused the May 26 incident and how the tank’s condition, maintenance, or other factors contributed to the release.

Across outlets, the emphasis is on the timeline and the prior warning: an earlier determination that the tank was not fit for service, followed by the later, deadly failure. While reports agree on the existence of the earlier inspection concern and the ongoing investigation, they describe the cause as still under review, with investigators continuing to determine the specific technical reasons for the rupture or release.