Nearly two dozen schools in Colorado, including Columbine High School, are reportedly on "lockdown."
According to KOAA, officials said that a "credible threat possibly involving the schools” had caused the lockdown.
A tweet sent out by the school system said that schools are conducting "business as usual" inside the buildings.
We have placed #ColumbineHighSchool, #LeawoodElementary, @bhelementaryco and all mountain schools on lockout. No fu… https://t.co/u3RfIYcnwU— Jeffco Public Schools (@Jeffco Public Schools) 1555438855.0
The lockdown comes just days before the 20th anniversary of the Columbine shooting, which occurred April 20, 1999.