Report says employees at contractor noted behavior that raised concerns . ( CNN ) -- Concerns about the `` mental stability '' of the Washington Navy Yard shooter were raised by his supervisors and others , but never reported to military officials as required , the Navy said on Tuesday . The report also said the company had a "culture of fear" and was not taking allegations seriously enough. Alexis Aaron shot and killed 12 people last year before being killed by police .
Report says employees at contractor noted behavior that raised concerns . The report also said the company had a "culture of fear" and was not taking allegations seriously enough. Alexis Aaron shot and killed 12 people last year before being killed by police .