A Massachusetts man was arrested in his mother's basement Saturday after posting what appeared to be a school shooting threat to Facebook.

Justin Moreira, 29, knew the reason police knocked on the door of his mother's house while he hid in his locked bedroom in her basement, according to prosecutors.

“Is this my post about shooting up a school?” Moreira asked responding officers, according to a report.

Moriera has a criminal history that includes prison time and a federal conviction related to firearm possession.

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A woman had contacted local police after seeing a disturbing message posted to social media by Moreira.

"I hate you all so much," the post read. "If you see me on the news for a school shooting, 57 students and teachers injured, or one pops up and never becomes solved, don’t be surprised."

When police arrived to his mother's residence, she led them to Moreira, who has hiding in his basement bedroom and refusing to exit, the report noted.

A family member opened the door, and officers reportedly struggled with Moreira.

He "was taken to the ground and put in cuffs," police said.

The man told police that "he just wants to scare people and it was a mistake. He said he had no intention of shooting up a school," prosecutors said.

Moreira suffers from substance abuse issues, his attorney said.

"He's been trying to find a job but does not have a job," the attorney said. "When you look at what it is that's posted, I would suggest that it's consistent with someone who is dealing with their own demons — drinking, drugging — sitting at the desk and posting something. He doesn't say kill — he says injured."

The prosecution asked for bail to be set at $1 million, the report noted.

A judge set bail at $100,000, ordered Moriera to submit to GPS tracking, and ruled that he cannot have internet access while the case is pending.

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His arrest came just days after a school shooting in Uvalde, Texas, in which a gunman killed at least 21 people, including 19 Robb Elementary School students and two teachers.