Student said she planned to kill people at her high school, then commit suicide.
PHOENIX (AP) _ Authorities say a 16-year-old girl from Mesa was arrested Thursday after she posted a threat on YouTube that she had a plan to kill people at her high school and then commit suicide.
The Maricopa County Sheriff Office says the girl had access to guns at her home, but never brought firearms to Red Mountain High School in Mesa.
The agency says investigators arrested the girl at her home Thursday morning and that she admitted to posting the threat.
Red Mountain High School was in session Thursday.
Investigators in Arizona say they received a tip about the girl from Canadian police.
