The Latest on a lockdown at Columbine High School and other Denver area schools (all times local):
2:30 p.m.
Authorities say tightened security at Columbine High School and about a dozen other Denver-area schools is related to an FBI investigation.
A spokesman for the Jefferson County Sheriff's Office, Mike Taplin, said Tuesday's school lockdowns involved an FBI investigation but he couldn't provide any details. The sheriff's office previously said the lockdowns were prompted by its investigation into what appears to be a credible threat possibly involving the schools
https://www.thestate.com/news/nation-world/national/article229337159.html