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The two boys, ages 14 and 15, had planned a shooting at Evergreen Institute of Excellence, in the Northern California town of Cottonwood, where they expected to kill up to 100 people, said Tehama County Sheriff Dave Kain during a news conference Tuesday.

“This was serious,” Kain said.

Kain said the shared image helped investigators contact school administrators, identify the two students, and take both of them into custody.

“Our investigators took that tip seriously since the beginning,” Kain said.

Firearms were also seized, Kain said.