(AOL) - San Diego State University has suspended six fraternities after a sweeping drug investigation that landed members of three fraternities in jail on suspicion of openly dealing drugs on campus.

1 of 5 Authorities on Tuesday said they arrested nearly 100 people, most of them students, in a sweeping drug bust at San Diego State University. Here, bags of drugs and handguns that were seized in the investigation are pictured.

The probe - prompted by the cocaine overdose death last year of a freshman sorority member - led to the arrests of 96 people, 75 of them San Diego State students. A second drug death occurred during the investigation.

Twenty-nine people were arrested early Tuesday in raids at nine locations including the Theta Chi fraternity, where agents found cocaine, Ecstasy and three guns. Eighteen of those arrested were wanted on warrants for selling to undercover agents.

Theta Chi and five other fraternities have been suspended pending a hearing on evidence gathered during the investigation, dubbed Operation Sudden Fall.

Authorities said some fraternity members openly dealt drugs, and that one sent a mass text message advertising special prices on cocaine. Two kilograms of cocaine were seized in all, along with 350 Ecstasy pills, marijuana, psychedelic mushrooms, hash oil, methamphetamine, illicit prescription drugs, several guns and at least $60,000 in cash, authorities said. Click here read full Scoopy Doop Raid