Former Columbine principal speaks at Sioux Falls conference

SIOUX FALLS, S.D. (KSFY) - The former principal of Columbine High School made a stop in Sioux Falls to discuss the lessons learned in Colorado and how to better prepare for tragedy in our community.

Frank DeAngelis spoke at a South Dakota Emergency Management conference Thursday morning.

He said people cannot change what happened at previous school shootings but can only prevent future violence.

"I still believe schools are the safest place, and we need to come together and say enough is enough," DeAngelis said. "I think what happened in Parkland got the kids saying 'never again,' and I think we need to all come together. We can't give up hope."

Thirteen people were killed when two gunmen opened fire at Columbine High School in Colorado on April 20, 1999.

At the time, it was the deadliest high school shooting in U.S. history.