Teen girl charged as adult in alleged mass-murder plot at high school
KDVR
KDVR - "Prosecutors said she told a detective that if she was released she would continue her violent plans, only she would be more secretive."

via KDVR:

DOUGLAS COUNTY, Colo. -- (KDVR) -- Prosecutors charged a 16-year-old girl as an adult Tuesday, accusing her of conspiracy to commit murder in a plot at Mountain Vista High School in Highlands Ranch.

Prosecutors in court Tuesday afternoon said Sienna Johnson not only planned but took steps to carry out a mass murder at the school. Authorities found out about the threat, and Johnson and another girl were arrested in December.

FULL STORY: Teen girl charged as adult in alleged mass-murder plot at high school - KDVR

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