A Massachusetts man, and former Roger Williams University law school student, is being medically evaluated at a New Bedford hospital following a stand-off with multiple police agencies at his Dartmouth home Tuesday.

Kevin Pacheco, 36, is awaiting arraignment in Massachusetts on charges of extortion and threats as a result of the 8-hour incident.

Law professors at the university alerted public safety early Tuesday morning after they received an "email manifesto" from Mr. Pacheco that was allegedly threatening.

Bristol Police Deputy Chief Steven Contente confirmed that at 9:38 a.m., Bristol Police were notified by university public safety officials that “harassing e-mails” had been received at the university’s law school.

Police determined there was a credible threat to the university and they immediately began an attempt to locate Mr. Pacheco.

He was found in his Richard Street home, which was quickly surrounded by SWAT team members, Massachusetts State Police, Dartmouth and New Bedford Police.

"Upon arrival, officers learned that Mr. Pacheco had barricaded himself inside of his room, and that he had access to firearms," Dartmouth Police Det. Kyle Costa in a press release. "In light of this, officers retreated and initiated emergency measures to ensure the safety of everyone involved."

Negotiators with the Southeastern Massachusetts Law Enforcement Council were called in to safely coax Mr. Pacheco out of his home.

"Though negotiations remained open with Mr. Pacheco throughout the encounter, he ultimately surrendered to authorities at approximately 6:30 p.m. after power was cut to his residence by NSTAR," said Det. Costa said.

Police then executed a search warrant on Mr. Pacheco's home. As a result of the search, detectives allegedly found a cache of guns, ammunition, and computers, as well as books related to becoming a serial killer and manufacturing methamphetamine.

Before Mr. Pacheco was apprehended, the university sent out a school-wide memo advising students, faculty and staff, to be aware of an increased police presence on campus.

Mr. Pacheco is a former law school student who was last enrolled at the university during the fall 2012 semester. In a secondary memo sent after his surrender, university officials said that "until the email received this morning, there had been no direct interaction with (Mr. Pacheco) in more than nine months."