As another mass shooting traumatizes a college campus -- this time the University of Nevada, Las Vegas -- California universities point to tools developed to protect students, staff and faculty.

Three people were killed in a shooting at the Las Vegas campus of the University of Nevada (UNLV) on Wednesday morning. The gunman, described as a white former college professor in his 60s, was killed in a shootout with police.

UNLV students and community members are describing their terror and shock after a person opened fire Wednesday, shooting at least three people and putting the city on edge.

One other victim remains in a critical condition at a local hospital, police said in a statement. UNLV and all other southern Nevada System of Higher Education institutions across the state will be closed for the rest of Wednesday.

Las Vegas police on Wednesday said there appear to be multiple victims in a shooting on the University of Nevada, Las Vegas campus. Police said the suspect was dead.