University police Chief Derek Poarch said the 18-year-old student was returning from Franklin Street at about 2:30 a.m. when she was forced to the ground near Alumni Hall.
Poarch said the student reported waking up about an hour later covered with scratches and bruises and that she had been "clearly sexually assaulted."
In North Carolina, sexual assault is defined as being forced to engage in an unwanted sexual act, Poarch said.
He said University police detectives are actively investigating the case, although the investigation might be complicated by the report being filed such a long time after the incident.
On Wednesday, a misdemeanor assault occurred in Morehead Parking Lot involving a 21-year-old student working as a temporary Department of Public Safety employee. Police said a Hispanic man who was about 5 feet 5 inches with a slight build, poor teeth and a slight mustache approached the student and spoke to her briefly in Spanish before touching her inappropriately.
"There is nothing to indicate to us that these two incidents are related -- how they occurred are totally different," Poarch said.
He said progress is being made in the investigation into Wednesday's assault.
"Several leads have come in that we are actively pursuing."
Poarch said both incidents underscore the importance of taking proper safety precautions, especially when walking on campus at night. He said that in the case of the Feb. 27 assault, the student was walking back from Franklin Street alone while her friends used the Point-2-Point shuttle.