75 students arrested in San Diego University drug bust

University police and federal drug agents worked together in the investigation, making more than 130 undercover drug buys were made at locations including fraternity houses, student parking areas and dormitories, authorities said.

Shawn Collinsworth, executive director of the national office of Phi Kappa Psi, said he was told by two of the SDSU fraternity chapter's leaders that four of its members were arrested. He added the fraternity is cooperating with the investigation.

"It isn't behavior becoming of Phi Kappa Psi," Collinsworth said.

San Diego State is one of the largest schools in California's state university system with about 34,000 students. The campus has an active network of fraternities and sororities.