The threat drew a large police response but agencies began leaving shortly after midday.
Columbine High School
Laura Farber's documentary "We Are Columbine" makes its Colorado debut this weekend at the Denver Film Festival.
The 12-day festival, which opens the end of the month, showcases a number of films by Colorado filmmakers or have a connection to the state, including “We are Columbine” and “The Front Runner.”
The Thursday night “Vote For Our Lives” rally was held at Clement Park in Littleton, just across the street from Columbine High School.
There were many parallels drawn between the 1999 Colorado shooting and the February shooting in Parkland, Florida.
Students stood, hushed, for 17 minutes as balloons were released into a clear blue sky overhead.
Every year since Neville was elected in 2014, he’s introduced a bill to allow concealed carry on school grounds.
Frank DeAngelis, who retired from Columbine in 2014, said the shooting survivors will deal with the tragedy in different ways.
The horror of April 20, 1999 changed Patrick Neville and Samantha Haviland's lives in different ways, yet inspired both to take action and serve others.
Scott's daughter, Rachel, was among 13 killed in the 1999 rampage in suburban Denver.