CHICAGO (CBS) — A fraternity at Indiana University has been shut down after a “highly offensive and vulgar” video showing a house member engaging in oral sex with a female stripper was released online.

“The National Office of the Alpha Tau Omega fraternity has revoked the charter and closed the Delta Alpha chapter at Indiana University following the release of a highly inappropriate and vulgar video,” the organization said in a statement.

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“The video from a smart phone shows a sex act that occurred last week. The event was unauthorized involving about half of the chapter’s membership. The National Fraternity investigation revealed the 21-year-old man in the video was an initiated member, not a pledge, and the two women in the video were exotic dancers hired by one of the members.”

Initially, the case was being investigated as a pledge hazing, but ATO, in its statement, said no pledge was forced to participate.

“Regardless, the actions are contrary to the ideals and principles of Alpha Tau Omega and are highly offensive.”

The approximately 30-second video shows the man performing oral sex on the woman, who is lying on her back on a mattress, her legs wrapped around the man’s head. Several other men are seen in the video, either naked or wearing their underwear.

The incident is not the first time the ATO house on the Bloomington campus has been punished.

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In March of 2010, about two-thirds of the fraternity’s members were kicked out, after an investigation into hazing and alcohol violations.

Last spring, a five-part series in the Indiana Daily Student, recounted other problems within the house.

In one case, a woman said she was raped last year during a “Ménage à Tau” party. The event required each fraternity member to have two female guests as dates, who attended the party wearing lingerie.

In 1992, a fraternity pledge was rushed to the hospital after being forced to drink excessive amounts of alcohol. The man’s blood alcohol level was measured at nearly .50.

“The revocation of the charter means the chapter is closed, effective immediately and all chapter activities must cease,” the national fraternity said.

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“The university applauds the national chapter’s swift and strong action and is in full agreement with this decision,” according to a news release. “The office of the Dean of Students and IU Police Department are prepared to work closely with the national ATO organization to facilitate this action.”