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WASECA, Minn. -- Authorities says they prevented an "unimaginable tragedy" by foiling a teenager's elaborate plot to kill his family and bomb the junior and senior high school in the southern Minnesota city of Waseca.

Police arrested the 17-year-old suspect Tuesday and charged him in juvenile court Thursday with four counts of attempted first-degree murder, six counts of possessing explosive or incendiary devices and two counts of criminal damage to property. The charges say he told police he intended to kill "as many students as he could."

Capt. Kris Markeson told reporters that authorities believe the teenager was acting alone and would have carried out the attack in the next few weeks if he hadn't been caught. Markeson said he was disturbed by the amount of guns and other material the youth obtained. He said he could not divulge if specific students were targeted. He said police were tipped by a resident who reported a suspicious person at a self-storage facility.

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