A high school student from Maryland is expected to face charges after her dad discovered a journal with a detailed plan to shoot up her school.

Authorities say the journal was found in the teen’s home along with a shotgun and bomb-making materials. The father of 18-year-old suspect Nichole Cevario told officials on March 23 about a "potential threat of violence towards the school," said the Frederick County Sheriff’s Office, and the daughter "was immediately removed from the classroom and turned over to investigators."

The school Cevario was allegedly plotting against was her own Catoctin High School in Thurmont, Maryland. "Bomb-making materials to include pipes with end caps, shrapnel, fireworks, magnesium tape, and fuse material" were located at the teen’s home, the sheriff's office revealed on Monday (March 27).

Authorities are also saying that the journal found clearly plans out a mass shooting. It laid out a time line and expectations for each stage of her impending plot. The diary’s entries go all the way back to December 16 of last year.

Cevario "had been compiling intelligence on behavior activities of the school, noting emergency procedures associated with drills conducted by school staff and obtaining intelligence on the School Resource Deputy," Frederick County Sheriff Charles Jenkins said. "It shocks the conscience to see that someone of that age could be thinking like this.”

No weapons or explosive devices were discovered on school property and the materials were never combined into an explosive device. All items Cevario bought were reportedly legal.

Watch the ABC World News report below.