A month before Maine’s deadliest mass shooting claimed the lives of 18 people, an Army reservist had attempted to alert authorities of his friend Robert Card’s erratic behavior, saying he feared Card could “snap and do a mass shooting,” police records show.

A text message exchange between a staff sergeant identified as “Hodgson” and fellow reservist and police corporal Kevin Mote showed concern about Card’s state of mind, multiple outlets reported Wednesday. The Boston Globe was first to report on the exchange.

“I believe he’s messed up in (the) head,” Hodgson reportedly wrote to Mote, discussing the concerning decline in Card’s mental health. “I love (him) to death but i do not know how to help him and he refuses to get help or to continue help.”

“And yes he still has all of his weapons,” he said around mid-September. “I believe he’s going to snap and do a mass shooting.”

Hodgson referred to himself as a friend of Card’s, and claimed he grew concerned after the man began speaking of imaginary voices that called him a pedophile, according to an accompanying memo authored by Mote.

In July, the gunman reportedly lashed out at his fellow reservists over the imaginary insults, while with a group that included Oxford County Sheriff Christopher Wainwright and Androscoggin County Sheriff’s Deputy Matthew Noyes.

Card allegedly shoved another soldier, and then proceeded to lock himself in his hotel room, refusing to come out.

Hodgson also said the future killer had threatened to “shoot up the drill center and Saco and other places,” Mote added, most likely referring to an army training center in Saco, Maine.

“I would rather err on the side of caution” because the reservist “is a capable marksman and, if he should set his mind to carry out his threats made to Hodgson, he would be able to do it,” he wrote.

Mote and his superiors requested the Sagadahoc County Sheriff’s Office to check on Card, who lived in their jurisdiction. It’s unclear how the gunman, despite these heavy warnings, was able to hold onto his weapons and ultimately perpetrate his attack.