Two Georgetown University students and a visitor to the school were arrested Saturday after authorities discovered a secret drug lab inside a dormitory room at the prestigious university.

A university source close to the investigation told FoxNews.com that investigators found a DMT lab where chemicals could create a hallucinogenic drug inside a room at Harbin Hall, a freshman residence hall. DMT stands for dimethyltryptamine.

"The Drug Enforcement Agency (DEA) has confirmed that an illegal drug, Dimethyltryptamine (DMT), was being produced in one residence hall room and was the cause of today’s incident," vice president of student affairs Todd Olson confirmed in an e-mail to students and faculty on Saturday. "Hazardous materials experts have now removed all potential contaminants."

Emergency crews responded about 6:15 a.m. on Saturday after a "strange odor" was reported on the ninth floor of Harbin Hall.

About 400 students were evacuated from the dormitory, authorities said, and seven people were exposed to noxious chemicals -- including three students.

A university official, who spoke to FoxNews.com on condition of anonymity due to the ongoing investigation, said authorities first believed that the suspects were producing possible methamphetamine inside the room.

Investigators later determined that it was DMT, a hallucinogenic that can be sniffed, smoked or injected.

All three suspects, whom authorities have not publicly identified yet, face charges of possession of drug paraphernalia.

Georgetown spokeswoman Julie Green Bataille said Sunday that no one was injured in the incident and that the rest of the campus is operating normally.

FoxNews.com's Cristina Corbin and the Associated Press contributed to this report