The attack, which occurred around 4:30 a.m., was reported to police within an hour.
This is the first reported sexual assault of the school year. Riley said he did not know of any similar recent incidents at other Boston-area schools.
HUPD issued a community advisory on Friday morning after discussions with the victim.
"This warning is very serious," he said. "There's a security issue here."
Dean of Freshman Elizabeth Studley Nathans said the Freshman Dean's Office (FDO) is making resources available to the victim and declined further comment.
"Our first concern is for the safety and welfare of both victim and community--ensuring immediate help and ongoing support to the victim, and urging on all members of the community the importance of safety and security measures," she wrote in an e-mail message.
Police warned students to be aware of any suspicious activity in their dorms and reminded them to lock their doors.
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