The University of Southern California will require anyone entering campus after 9 p.m. to show ID proving that they are students, faculty, staff or guests of those groups, USC President C.L. Max Nikias announced Tuesday.

The 9:00 p.m.-to-6:00 a.m. restrictions will be in full force seven days a week beginning when second semester starts in January.

"I emphasize in the strongest possible terms that we remain and always will be a campus that welcomes all our neighbors for recreation, entertainment, education, and the community programs that have made USC a proud University Park neighbor for 132 years," Nikias cautioned.

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Nikias also announced an increase in the number of security cameras around the University Park campus perimeter and an increase in the number of campus security and private security guards. Within campus, security personnel will check IDs at the entrances to USC residence halls around-the-clock. On Monday, university housing officials announced fingerprint scanners would be added as an additional security measure.

MORE: USC To Install Fingerprint Scanners In On-Campus Residences

The swift changes come a week after at a Halloween night shooting on campus that left four people injured. A party on campus promoted by a private group, but organized by the school's Black Student Assembly attracted non-students and non-guests to campus. They were the ones involved in the shooting, campus and police officials have said.

"The measures I will describe are intended to prevent that circumstance from arising again," Nikias wrote to the USC community in a letter Tuesday morning.

Nikias said the use of outside event promoters will no longer be permitted and that applications to hold events on campus would "undergo heightened review."

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