The mum, known only as Nicole, said her 17-year-old son described detonating pipe bombs and using multiple guns to "blast anyone in sight" and "execute survivors" at College Place High School in the U.S. state of Washington.
"Their lives would have been forever changed".
That choice was calling the police after finding and reading her son's journal.
Police say officers informed the southeast Washington school of the threat, but school was already done for the day. "It's devastating. I know I did all I can do and that I made the right choice", she added.
In the entry, Nicole's son allegedly detailed the specifics of his planned attack, including the use of pipe bombs and firearms to "blast anyone in sight".
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Nicole said the incident made her feel like she had done "something wrong" as a parent, adding that her teenager, who she still loved, had been battling depression and that she hoped he would be safer in jail.
Police believe she did everything right.
Nicole said she confronted her son, who allegedly said it was a creative writing exercise and "just a story".
"She's very courageous", Tomaras said. "That's beyond normal", said Troy Tomaras, College Place Police Chief.
"That's beyond creative writing".
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"The mother wanted to prevent others from being hurt, and wants her son to get the help he needs".
"It takes a lot to do what I did.it wasn't easy".
The alleged attack was planned for the 21st anniversary of the Columbine High School massacre, which left 12 students and one teacher dead before the perpetrators, a pair of seniors, committed suicide.
"She's very courageous, it's clearly very emotional for her".
When police searched the College Park High School student's bedroom, they discovered the books 'The Anarchist Cookbook, ' which describes how to make explosives, and 'The Truth Behind Death at Columbine, ' reported My Columbia Basin.
Rain heavy at times, below average temperatures
Look at those high temperatures for north Alabama on Monday! Thu: High: 64 Low: 62 AM showers, then mostly cloudy and windy. Tonight , temperatures will quickly drop after sunset , but temperatures are not expected to be as cold as this morning.