The suspect is believed to be Robert Card, a 20-year US Army veteran from Bowdoin Center, Maine.
(according to Telegrams so take with grain of salt)
EDIT: Name confirmed by news.
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According to law enforcement, CARD recently reported mental health issues to include hearing voices and threats to shoot up the National Guard Base in Saco, ME.
Having lived in Lewiston a long time, I can tell you the cops there are all totally incompetent. They're not even murderous psychos that big city police forces hire. Just total dumbasses riding around eating donuts 50 hours a week. The police station is like a five minute drive from where this guy started shooting.
If you drive twenty minutes in any direction it's all woods and camps though. A helicopter can't do shit, there's no surveillance cameras, and very few people to call in tips.