KANSAS CITY, Mo. (AP) - The mother who reported her son to police after fearing he was planning to attack a southeast Missouri movie theater says he'd recently asked her if he was a failure.

Tricia Lammers made her first public statements Tuesday since the arrest last week of her 20-year-old son, Blaec.

Authorities say he plotted to attack the theater in Bolivar during the new "Twilight" film, then a nearby Wal-Mart. Investigators say he'd recently purchased two assault rifles and 400 rounds of ammunition.

KLOR-TV reports his mother spoke at the National Alliance for Mental Illness in Springfield.

She said her son has undergone inpatient treatment and shows signs of Asperger's syndrome, borderline personality disorder and other conditions.

She says, "he didn't ask to be born different" and told him he wasn't a failure.

A southwest Missouri man accused of plotting to open fire inside a theater during the "Twilight" movie underwent a mental evaluation in 2009 after following around a Walmart store clerk.

An arrest report released Tuesday says Blaec Lammers also brought a knife to the Walmart store in Bolivar looking for an "easy victim" after watching the horror film "Halloween."

He told authorities he was planning to follow the clerk into a storage room and kill him when he heard his name over the public address system. No charges were filed.

His public defender declined comment Tuesday.

Copyright 2012 by The Associated Press. All rights reserved. Material may not be redistributed.