HUPD units and Cambridge police searched the area immediately after receiving the report but were unable to locate the suspect.
At the time of the incident, he was wearing a dark T-shirt, boots and possibly jeans or light khaki pants. He was carrying a black backpack.
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HUPD detectives are continuing to investigate the crime, HUPD spokesperson Peggy A. McNamara said.
She asked that anyone with information about the assault call the Criminal Investigation Division at (617) 495-1796.
McNamara advised that students should be aware of their surroundings, and that those who are out late should travel in groups whenever possible.
—Staff writer Garrett M. Graff can be reached at ggraff@fas.harvard.edu.