(NBCPHILADELPHIA) — A senior at Radnor High School was arrested Monday after police say she wrote a detailed plan to murder her classmates and a teacher.

Investigators say the 17-year-old girl wrote in her notebook that she wanted to be the first female mass murderer, and specifically described how she would kill several students and one of her teachers at the Philadelphia-area school.

She also allegedly wrote about how much she admired Eric Harris and Dylan Klebold, the students behind the 1999 Columbine High School massacre.

“But imagine the power,” the girl allegedly wrote. “The bullets leaving the gun with a loud bang, piercing kids around me, the way they collapse, their blood splattering the floor… the screams.”

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