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. The investigation - 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. Authorities said fraternity members openly dealt drugs. Authorities said 2 kg of cocaine were seized in all, along with 350 Ecstasy pills, marijuana, other drugs, several guns and at least US$60,000 in cash.