At the Mathematical Sciences Building, near Boelter Hall, police officers in tactical gear stood at entryways holding rifles.
Nine students walked out of the building with their hands raised in the air and were led to a sidewalk by an LAPD officer.
The officer told the students to kneel in a line and then methodically searched each one. Afterward, the students walked one by one down the sidewalk, away from the building as police helicopters clattered overhead.
The shooting took place at the Boelter Hall complex, according to UCLA spokesman Ricardo Vazquez. He had no further information on whether the shooting took place in a classroom, or on the identities of victims or shooters.