Resident Omer Soysal said attempted break-ins and holdups are common at the apartments, where nearly all the residents are international students.
"When it is dark, I tell my kids: 'Don't go outside,'" said Soysal, 37, a third-year Ph.D. candidate in computer science.
LSU officials sent a campus-wide alert out after midnight, more than an hour and a half after the shootings. Officials sent out e-mail and voicemail messages and posted a message on the university's Web site. But the text message alert did not reach all its recipients.
A problem with the text-message service provider was corrected by afternoon, according to a brief news release late Friday from the university.
Bhayroo said he signed up for the text-messaging system days after it was set up but never received any messages, before or after the shootings.
"There haven't been any," Bhayroo said. "Many of us took comfort that LSU implemented this system, so it's worrisome that the system doesn't work."
The company hired to run the text-messaging system hasn't determined how many people received the message, O'Keefe said. The news release said all current and future subscribers will now get text messages.
Associated Press writers Mary Foster and Doug Simpson contributed to this story.