Columbine, other suburban Denver schools on lockdown

LITTLETON, Colo. (AP) — Columbine High School and about a dozen other schools are on lockdown as law enforcement says it is investigating what appears to be a credible threat possibly involving the schools.
School officials say the doors were locked but classes were continuing Tuesday at Columbine and two other nearby schools and at other schools farther away in the district.
The Jefferson County Sheriff’s Office said deputies were posted at the schools involved.
The lockdown comes j