A judge ruled Monday that the Clark County School District was negligent during a school activity in 2013.
The incident happened during a senior breakfast at Canyon Springs High School that encouraged incoming seniors to bring their friends.
However, six men snuck onto campus and attacked three teens with pistols.
One of those teens were left with a fractured skull. On Monday, a jury ruled that the school should have done a better job of keeping the men with guns away from campus.
Each of the three teens who were injured that day will be awarded $200,000 for past and future damages.