The force on Wednesday said the individual was detained on Lantau Island the day before on suspicion of indecent assault and voyeurism.
The suspect, who also studies at the university, was in the morning held for questioning, according to a police spokesman.
Hong Kong police probe second university sex assault, Lee calls for discipline
Hong Kong police probe second university sex assault, Lee calls for discipline
The arrest was made as the number of alleged victims involving the same suspect rose to four.
The man is accused of raping the 18-year-old woman at Po Leung Kuk Jockey Club Tai Tong Holiday Camp in Yuen Long in the early hours of July 23 during a two-day orientation camp there.
He is also linked to a separate incident last month, where he was said to have gone into a bathroom and pulled open the shower curtain as a 22-year-old woman was taking a bath at another orientation camp on Lantau Island just after midnight on August 28.
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Police did not reveal details of the other two cases.
The fresh allegations came in the wake of separate sexual assault complaints centred also on an orientation camp at the University of Hong Kong last month.
Tang Ho-yin, a second-year HKU student, was on Monday charged with sex assaults on an 18-year-old woman in an activity room at Po Leung Kuk Jockey Club Tai Tong Holiday Camp on August 20, and with groping her again in a dormitory room the next day. He was released on bail.
HKU student bailed by Hong Kong court in orientation camp sex assault case
HKU student bailed by Hong Kong court in orientation camp sex assault case
The cases have prompted the city’s leader to remind varsities of their responsibilities to maintain discipline. Condemning the alleged cases, Chief Executive John Lee Ka-chiu on Tuesday said such acts were “intolerable”.
“If there is any behaviour that is illegal or that infringes on the rights of others, schools must cooperate with law enforcement to ensure that we can deal with such conduct,” Lee said, pointing out that society had expectations of university students and they should observe proper conduct.
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He said he hoped all educational organisations, especially universities, would improve the conduct of students on top of providing a good learning environment.
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