Authorities have charged a Grand Rapids High School student with making terroristic threats. Eighteen-year-old Derrick Marttila faces three felony counts. Police says several students told investigators Marttila repeatedly threatened to bomb the school and shoot students whose religious beliefs differ from his own. Police dispatcher Amy Olson says officers started investigating the threats before the Littleton, Colorado school shooting. She says police arrested the teen when other students became increasignly afraid Marttila would act on his threats: police are still investigating. They believe the suspect was acting alone in his threats.