An 18-year-old transgender student was arrested on Wednesday after police learned of the individual’s plan to commit a mass shooting at her Maryland high school and a nearby elementary school.

The Montgomery County Police Department (MCPD) found a 129-page “manifesto” written by the suspect, who is named Andrea Ye but goes by Alex.

According to 7News Maryland Bureau Chief Brad Bell, “Ye is biologically female though identifies as male.”

Ye was previously receiving treatment at a psychiatric facility when another person in the psych ward learned of the manifesto and reported it to the police, fearing she’d act upon the “realistic” writings.

Charging documents show Ye also told her counselor about urges to harm people, wanting to use a gun against innocents and even describing a hypothetical attack at her high school graduation.

The individual allegedly hoped to achieve fame in connection with an act of mass murder.