No charges will be filed over an alleged rape at a fraternity house on the University of Arkansas campus after prosecutors launched an investigation into the conduct of three Razorback basketball players.

Prosecutor John Threet told The Associated Press that details from witnesses and statements from the alleged victim herself showed a lack of evidence.

Threet said the woman had attended a party at the Phi Gamma Delta house the first week of classes at the school and that alcohol was involved.

Earlier Wednesday, deputy prosecuting attorney Dustin Roberts had told Rogers television station KHOG that charges could be filed by the afternoon.

University police Lt. Gary Crane told the AP that a female student had filed a complaint saying she was raped on Aug. 27 at the fraternity house, a short walk from the arena where the basketball team plays.

The university's director of athletics acknowledged the investigation into some of its student athletes in a statement released Wednesday, according to The Arkansas Traveler.

“The athletic department is aware of an ongoing investigation into an incident involving an alleged sexual offense. We are also aware that students, including student-athletes, have been questioned regarding this matter,” said Jeff Long. “The department and our student-athletes have cooperated fully with the investigation and will continue to do so. We will not speculate on any allegations.”

Crane said the alleged attack happened between 1:30 a.m. to 2 a.m. at the house, which is a block away from Bud Walton Arena where the basketball team plays.

It was "an acquaintance-type situation" that involved alcohol, Crane said. The campus police agency declined to file charges after its own investigation.

"The University of Arkansas Police Department did not feel at the time that there was probable cause to make an arrest, and it was sent to the prosecutor's office for essentially a warrant review to see if there's enough evidence that we believe sufficient to issue a warrant," Roberts told KHOG.

Crane declined to identify those under investigation.

A spokesman at Phi Gamma Delta's national headquarters in Lexington, Ky., did not immediately return a call for comment.

It was one of two rapes reported on the campus in as many weeks. Last Friday, a second rape claim resulted in the arrest of a university housing staffer, according to the Traveler.

The Razorbacks' basketball team has had its share of off-the-court issues.

Coach John Pelphrey has disciplined players several times in his two seasons as coach, including at the end of last season when he suspended Jason Henry days before the Southeastern Conference tournament for an unspecified violation of team rules. Henry is no longer with the team.

After leaving Arkansas in August 2008, guard Patrick Beverley said somebody wrote a paper for him while he was with the Razorbacks. Earlier this year, the program was put on notice by the NCAA about its low academic-progress rate.

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The Associated Press contributed to this report.