DETROIT (AP) — Two parents charged with their son in a Michigan school shooting failed to get their $500,000 bond reduced Friday, as prosecutors offered new allegations about the teen's hallucinations, passion for guns and boasts about violence.

James and Jennifer Crumbley, who are charged with involuntary manslaughter in the Oxford High School shooting, ignored numerous warning signs about Ethan Crumbley and instead bought him a gun that was used to kill four students and injure others on Nov. 30, assistant prosecutor Marc Keast told a judge.

In August, Ethan made a video with a different gun...