A Stanford University freshman is facing five felony sexual-assault charges, including rape of an unconscious person and rape of an intoxicated person, for an alleged Jan. 18 on-campus incident that was reportedly stopped by students passing by.

Brock Turner, 19, a member of the men's swim team, was arrested early in the morning on Jan. 18 after students came across him allegedly assaulting a woman, who is not a Stanford student, outdoors in the 600 block of Lagunita Court. He was booked into the San Jose Main Jail on two charges, attempted rape and digital penetration with a foreign object, and released the same day on $150,000 bail.

The Santa Clara County District Attorney's Office filed five charges against Turner on Tuesday: rape of an intoxicated person, rape of an unconscious person, sexual penetration by a foreign object of an intoxicated woman, sexual penetration by a foreign object of an unconscious woman and assault with intent to commit rape.

The district attorney said the students who intervened were instrumental in stopping the alleged assault, according to the university.

"Several students, both graduates and undergraduates, were upstanders in this situation," Catherine Criswell, the university's Title IX Coordinator, said in a statement. "They made the courageous decision to intervene and provide assistance. That is exactly the type of leadership and caring we attempt to cultivate in our community, and we commend those students on their courage and quick response."

The Stanford Department of Public Safety immediately conducted an investigation into the incident and sent its findings to the district attorney for review. The university has also launched a separate investigation under its Title IX process.

Turner has voluntarily withdrawn his registration from Stanford and he is not eligible to re-enroll, the university said. He is scheduled to be arraigned on the charges Monday.