UNLV shooting: Video shows terrifying moments Las Vegas police evacuate building

A video shows terrified people being directed to evacuate a University of Nevada, Las Vegas building as police responded to an active shooter on Wednesday.

Crowds of students ran for their lives after a gunman attacked the campus on Wednesday morning, killing three people and critically wounding a fourth. 

Police later identified the gunman as 67-year-old Anthony James Polito, a resident of nearby Henderson, Nevada. Authorities say Polito had applied for several jobs at various colleges and universities in Nevada but was rejected each time. 

Polito was killed by police during a shootout Wednesday.