An Army investigation found “multiple communication failures” regarding warning signs in the months leading up to reservist Robert Card committing the worst mass shooting in Maine’s history before killing himself in October.

Card shot and killed 18 people at a bowling alley and a nearby restaurant in Lewiston after a series of communication breakdowns among his military chain of command, civilian law enforcement and civilian hospitals treating him for mental health concerns, according to the investigation, publicly released on Tuesday.

In one instance, Four Winds, a hospital treating Card, found him to be at a “very low risk” of committing harm against himself or others despite his being admitted due to reports of psychosis, aggression and “homicidal ideations” such as having a “hit list.” He also “appeared resistant to psychoeducation, and he blamed others for his behavior.” He was discharged in August 2023 for unknown reasons.

Another communication failure came when Four Winds did not send discharge documents to the military medical system for eight days after Card’s release. Once received, the documents were not uploaded into Card’s medical record for another 10 days nor closely reviewed, “which would have revealed troubling information that could have been relayed to the chain of command.”

The Army Reserve has taken “adverse administrative action” against three officers in Card’s chain of command for “dereliction of duty,” a summary of the report states.

In total, the investigating team of a senior military........

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