Two local law enforcement chiefs told The Associated Press that a statewide awareness alert was sent in mid-September to be on the lookout for Robert Card after the firearms instructor made threats against his base and fellow soldiers. But after stepped-up patrols of the base and a visit to Card's home - neither of which turned up any sign of him - they moved on.
https://abc7chicago.com/maine-mass-shooting-robert-card-veiled-threats-gun-laws/13986021/