17-Year-Old Allegedly Planned to Kill His Parents, Start a Fire to Divert Police and Bomb His School

Chellsie Scelhasc thwarted the alleged plan of John David Ladue when she saw him in her backyard, phoned police.
2:12 | 05/02/14

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Transcript for 17-Year-Old Allegedly Planned to Kill His Parents, Start a Fire to Divert Police and Bomb His School
Turn to a fresh reminder tonight that intuition can be a powerful weapons saving lives especially in this era of school violence a woman. Saw something strange outsider kitchen window and followed her instincts she took action on her quick thinking. May have prevented another tragedy ABC's Alex for -- Tells us what she saw what she did and what is happening tonight. -- looks like your average teenager strumming his guitar but tonight prosecutors say they want to try seventeen year old John David Ladoux as an adult. For allegedly plotting a sinister -- to kill his own family and and a bomb his school just days from now police revealed the alleged plan yesterday saying the potential massacre was stopped. Thanks to this woman Chelsea shelves -- with black laurel road and cut. Allred and cut through -- But do you allegedly amassed an arsenal in a storage facility and this Tuesday he was heading there when Chelsea shell -- saw him cutting through her backyard and got -- Vicious he was if Chang had to be seen by -- -- -- Look suspicious -- not. Trying to be seen. Police say Ladoux has sketched out every detail planning to kill his mother father and sister and start a fire to create a diversion for law enforcement's and that he would end up here that was seek a junior senior high school to carry out the rest of his attack. He intended to set off numerous bombs during the lunch hour. -- -- school resource officer as he responded to help. Set fires and shoot students and staff. She called 911 and police soon arrived and found the -- in the stores now. Officers observed materials in the storage locker which were consistent with bomb making but do admitted to placing explosive devices at a school and at a park earlier this month in what he said we're practice runs. Tonight Chelsea cell lines is being hailed a hero your quick thinking may have saved lives on bill. -- -- Good I'm glad I chest -- my got -- just a fact that we. Could have sapped of and we didn't add it later than a horrible feeling. Alex for a CBC news was -- Minnesota.

This transcript has been automatically generated and may not be 100% accurate.

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