By Andrew Hay

Oct 22 (Reuters) - The University of Arizona has suspended a fraternity after a female student alleged she was raped ‌at its house by two men, the latest action taken by ‌a major US university against a Greek chapter over accusations of sexual assault.

The university suspended ​Sigma Phi Epsilon, which was already on probation for hazing new members, on Wednesday after the KOLD-TV station reported the allegations of a female student who said she was raped at the chapter's fraternity house in Tucson. The university ‌said it was investigating.

"It has ⁠been determined that your organization presents a substantial risk to members of the university community," Whitney Mohr, associate dean of ⁠students, said in a letter to the fraternity.

The female student told police she was at the Sigma Phi Epsilon fraternity house with friends and residents of ​the ​chapter around midnight on August 26 when ​she woke up in a ‌dark room being sexually assaulted by two men, according to the September police report published by KOLD-TV.

Sigma Phi Epsilon's national CEO Brian Warren said it took courage for the student to come forward, that she deserves a complete investigation, and that the fraternity does not tolerate sexual assault or sexual ‌misconduct.

"The fraternity has suspended the membership of ​those involved while the investigation proceeds," Warren said in ​a statement. "Any member found responsible ​will be expelled, and we will cooperate fully with ‌law enforcement as it seeks accountability ​under the law."

US universities ​have come under growing pressure to crack down on misconduct following allegations of sexual assault by fraternity members at Cornell University.

Earlier this ​month, the University of ‌Arizona suspended all fraternity activities during investigations into alleged hazing, ​physical assault and drug and alcohol violations.

(Reporting by Andrew Hay in ​New Mexico; editing by David Gaffen)