UCLA received a bomb threat on Wednesday evening and, as a precaution, ordered residents evacuated from campus housing at about 10:10 p.m.
Many of the residents who were affected gathered safely in Drake Stadium while emergency responders checked campus facilities. No suspicious device was found. At 12:20 a.m. on Thursday, residents were allowed to return to all residence halls at UCLA.
Police are continuing to investigate.
UCLA is currently in summer session. Residence halls are occupied by a mix of summer students, visitors attending camps and workshops and faculty members who live in quarters on The Hill.
This story was updated at 12:35 a.m.