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.
What a terrible cold way to look at this tragedy. Anyway by my math using state populations it's about 1/10th of a 9/11.
Edit: if you use cities as the denominator, its about four 9/11s.
So applying 9/11 inflation, it's about 5 9/11s?
I already adjusted for inflation. The actual number I got was 3.7 9/11s.
Oh sorry, you're right.