A student leaves Columbine High School late Tuesday in Littleton, Colo. Authorities say they are looking for a woman they say presented a credible threat ahead of the 20th anniversary of the mass shooting there.
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A student leaves Columbine High School late Tuesday in Littleton, Colo. Authorities say they are looking for a woman they say presented a credible threat ahead of the 20th anniversary of the mass shooting there.