Shooting suspect warned of violence in online post

OMAHA, Neb. – The teen suspected of shooting two administrators at his Omaha high school warned in a Facebook post on the same day of the attack that people would hear about the "evil" things he did and said the school drove him to violence.

Police say 17-year-old Robert Butler Jr. opened fire Wednesday at Millard South High School, wounding his principal and vice principal before killing himself. Authorities say they don't know what prompted the attack.

Butler recently transferred to the school from Lincoln, Neb. He wrote in the post that Omaha changed him and said he wanted people to remember him for who he was before affecting "the lives of the families I ruined."

A friend of Butler's from a high school in Lincoln confirmed the Facebook post.

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Associated Press Writer Ryan Foley in Iowa City, Iowa, contributed to this report.