HARRISBURG, Pa. — A Penn State University fraternity was suspended for a year Tuesday after police began investigating allegations that members used a private, invitation-only Facebook page to post photos of nude and partly nude women, some apparently asleep or passed out.

A former member of Kappa Delta Rho at the university’s flagship campus in State College tipped police off to the page, telling them in January that it had been used by members to share photos of “unsuspecting victims, drug sales and hazing,” according to a copy of a police warrant obtained Tuesday by The Associated Press.

The ex-member also provided authorities with printouts from the page.

The fraternity’s national executive director, Joe Rosenberg, told the Penn State chapter in a letter on Tuesday that it is banned from most activities for the near future and must reorganize.

He said the suspension was “for the most serious misconduct, most serious disregard of fraternity rules, policies and property by the chapter.”

Chapter officials, who can appeal the decision, did not respond to messages seeking comment.

A Penn State administrator called the allegations a violation of the standards and values required for recognized student organizations.

“The evidence offered by the Facebook postings is appalling, offensive and inconsistent with the university community’s values and expectations,” Damon Sims, Penn State’s vice president for student affairs, said in a news release.

Sims vowed that the university would find those responsible and hold them accountable.

Police said anyone who posted the photos could face arrest on charges that include invasion of privacy.

An investigation of the informant’s computer “yielded information on two victims whose images would rise to the level of criminal action,” State College police Lt. Keith Robb said Tuesday.