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.
We're up to an average of 1-2 a day now, though; but formal statistics are explicitly legally prohibited from being gathered and compiled because pediatricians tried to turn it into a public health issue several decades ago.
You would not fucking believe how many toddlers find their dad's "unloaded" pistol, please do not ask me how many times a year I am rewarded for my poor life and career choices by being reminded of this