KANSAS CITY, Mo. — A southwest Missouri man accused of plotting to shoot up a movie theater during the new ‘‘Twilight’’ film was charged Friday after his mother contacted police, telling them she worried her son had purchased weapons similar to those used during the fatal Colorado theater shooting.

Blaec Lammers, 20, of Bolivar, is charged with first-degree assault, making a terroristic threat and armed criminal action. He was jailed in Polk County on $500,000 bond.