A Crofton man who threatened a mass shooting at a Prince George's County office where he was once employed was admitted to a hospital after undergoing a psychiatric evaluation, according to prosecutors.

Neil Prescott was checked into Anne Arundel Medical Center -- where doctors evaluated his mental health on Friday -- and may be in the hospital for up to a week for care, said John Erzen, spokesman for Prince George's County State's Attorney Angela Alsobrooks.

Authorities said they're still considering all possible charges, some state and federal charges are possible, but none have been filed as of Saturday afternoon, according to Erzen.

Prescott, 28, was taken into custody early Friday morning after authorities in Prince George's received reports of threatening phone calls he made to a supervisor at Pitney Bowes, a software and mailing equipment supplier located at 9140 East Hampton Boulevard in Capitol Heights.

Prescott made two phone calls to the facility, from which he was in the process of being fired, threatening to hurt employees.

"I am a joker, I'm gonna load my guns and blow everybody up," Prescott said, according to court records.

Anne Arundel County police found Prescott at his home Thursday night, where he groggily greeted them at the door wearing a shirt that said, "Guns don't kill people, I do."

About 25 firearms and several thousand rounds of ammunition were recovered in the search, an ATF official said. The firearms were described as semiautomatic.

Prince George's County Police Chief Mark Magaw said he thinks Prescott's reference to the joker, a villain from the popular Batman move trilogy, was a "fairly obvious" sign he was motivated by last week's shooting in Aurora, Colo.

Twelve people were killed and 58 wounded last week when a gunman opened fire in a theater during a midnight screening of the "The Dark Knight Rises." The suspect in that incident died his hair orange-red and had reportedly told officers that he was the Batman villain "The Joker."