All three incidents took place in broad daylight in the afternoon. The most recent one took place at Duncan Hall.
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Police say the female victim was in a stairwell. The suspect reportedly sexually battered her then took off running up the stairs. He's described as a man in his 20s with black spikey hair, wearing a dark gray hooded sweatshirt, dark pants and a navy blue backpack.
Just two days before, on Monday, another incident occurred that's being classified as a sexual battery and police released surveillance photos of the suspect.
He followed the female victim into the student union and sexually battered the woman.
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Police say the two incidents do not appear to be connected.
A third sexual battery was reported on November 30. ABC7 News' media partner, the Mercury News, says a woman told police she was assaulted by a man while walking down the northeast stairs of Sweeney Hall.
University police officers are asking for tips. Students can give them a call on the blue light phones all across campus.