"Our first reaction was to lock our door all the time," said Lodges resident Nancy Krutty, who lives a few doors down from the apartment where a strange man snuck in last week.
"It was really freaky to have it be in the same building where you live," Krutty said.
She and her roommates aren't walking alone anymore after a guy waited around their apartment complex to sneak in.
The man followed a girl into her apartment, and waited in her bedroom while she showered on Wednesday.
A roommate came home, and he ran off, but he didn't take anything, so police think he was there to hurt her.
The women who live there want to stay anonymous because police believe they may have been targeted.
The investigation isn't over yet, so East Lansing police are warning students to be on the look out.
"These are crimes of opportunity," said Lt. Scott Wriggelsworth of East Lansing Police.
Investigators think the man came in through an open door, but students say its also possible he may have come in through an unlocked window.
"If somebody's out there looking to break into a house, they're gonna go to the house that it's easiest for them to get into," Lt. Wriggelsworth said.
He's also warning students not to open your door if you don't know who's on the other side, because staying vigilant is what keeps students safe.
If you're worried about your home being targeted, you can reach out to East Lansing Police and they'll check on it while you're gone.