WASHINGTON - There's concern on the Georgetown University campus where security presence has been heightened after a two-year string of sexual assaults.

Police are trying to determine if they are dealing with one suspect or more than one -- less than 24 hours after the latest attack. Authorities say the incident early Tuesday morning occurred on the actual campus and left a female student sexually abused.

As Georgetown students prepare for the first day of class Wednesday, increased local and campus police are keeping watch. "There definitely are a lot more police and it makes you feel safer when they're around," said Danielle VanFossan, a sophomore.

Students received public safety alert e-mails Tuesday notifying them that a female student living in the on-campus "Village A" apartment building awoke to find a man in her bed. Police say the man sexually assaulted her and then ran out the front door after she screamed.

"A lot of incidents we hear about are off campus," said Stephanie Pazuelos, a sophomore. "I find it rare to hear about something on campus."

For two years, the Georgetown community has been on the lookout for whoever is behind more than a dozen similar break-ins. But this time, police say there are some slight differences -- including the suspect description, the on-campus location and the timing just one day after the last attack.

"That leads us to keep an open mind that we're dealing with one suspect or multiple suspects," said Commander Matt Klein of the Metropolitan Police Department (web | news) .

Police say it appears the man entered though a ground floor window and say students should be extra vigilant locking all possible entrances. In the dorms, monitors are checking who comes and goes.

"They're making sure we swipe in -- that we live in the building as well," said Leah Gleibman, a sophomore.

Students living off campus are warned to be just as cautious.

Most Georgetown dorms have secured entrances but the apartments where Tuesday morning's incident occurred have private entrances which might be easier for an intruder to get inside.

Campus police say students in either setup need to take measures to protect themselves.

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