After he was tackled, the teenager suspected of stabbing 21 people at his Pittsburgh-area high school refused to drop his knives and said “My work is not done, I have more people to kill,” according to a criminal complaint released Friday, CNN reports.

Alex Hribal, the alleged attacker, was tackled by a vice principal and taken into custody after stabbing 20 fellow students and a security guard at Franklin Regional Senior High on April 9. All of the victims survived, though several were hospitalized.

The Westmoreland County District Attorney John Peck told CNN Friday that Hribal is now being charged with 21 counts of attempted homicide as well as other charges, including bringing weapons—two 8-inch kitchen knives–onto school property. He was previously charged with four attempted homicides and 21 aggravated assaults counts. He was charged as an adult in both cases, according to CNN.

The criminal complaint released Friday revealed that investigators found a note in the suspect’s locker that appeared to signal his intentions, CNN reports.

“I can’t wait to see the priceless and helpless looks on the faces of the students of one of the ‘best schools in Pennsylvania’ realize their previous lives are going to be taken by the only one among them that isn’t a plebeian,” the note reads.

[CNN]

Write to Noah Rayman at noah.rayman@time.com.