Police have charged a 20-year-old man with planning to shoot up a Bolivar, Mo., screening of "The Twilight Saga: Breaking Dawn -- Part 2" -- a plot that calls to mind the mass-killings at a late showing of "The Dark Knight Rises" last summer.

Blaec Lammers, 20, has been charged with first-degree assault, making a terroristic threat and armed criminal action, according to a Bolivar Police Department spokesman.

He is being held in Polk County Jail on $500,000 bail, the spokesman said.

Police were alerted to Lammers' plans by his mother, who became concerned after he purchased assault weapons and more than 400 rounds of ammunition, according to a police department probable cause statement.

After being picked up at a local Sonic, he confessed to police that he was planning a shooting spree and had bought a ticket to a Sunday screening of the "Twilight" sequel. However, he told police he was worried he would run out of ammunition, so he hatched another plan to open fire on shoppers at a local Wal-Mart.

He theorized that if he ran out of ammunition, he could break the glass and take some from the store's gun shop.

Lammers said he had little experience handling a gun and also admitted he was not taking his medication. The police report did not specify the type of medication.

In 2009, Lammers stated that he wanted to stab a Wal-Mart employee to death. He followed an employee around the store before he was contacted by officers.

The planned shooting seems to have been partially inspired by the movie theater killings in Aurora, Colo., last July. The theatrical exhibition industry was badly shaken after James Holmes, a 24-year-old former neuroscience student, killed 12 people and injured 58 others at a midnight screening of "The Dark Knight Rises."

A hearing on his case was delayed this week after Holmes reportedly attempted suicide.

The Springfield News Leader first reported Lammers' arrest.

Related Articles:

How 'Twilight' Made the Movie Business Respect Girl Power

Colorado Shootings and 'The Dark Knight': Too Many Guns and a Violent World

Michael Moore on the 'Dark Knight' Shooting: 'We Are a Violent Nation' (Exclusive)