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.
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.
looks like another white guy?
Removed by mod
And he was known to the authorities, but they declared him a good fella and let him go
Firearms instructor for the army so yea clearly wasn’t radicalized by terrorists. No siree.