(CNN) -- Only one student remains in critical condition after a stabbing rampage earlier this month at a high school outside Pittsburgh, a hospital official said Saturday.
A spokeswoman for Forbes Regional Hospital in Monroeville, Pennsylvania, said a 15-year-old boy injured in the incident remains in critical condition.
Suspect Alex Hribal, 16, is alleged to have seriously injured at least 20 students and a security officer at Franklin Regional Senior High School in Murrysville, Pennsylvania, on April 9.
He has been arraigned as an adult and faces four counts of attempted homicide and 21 counts of aggravated assault.
Murrysville, with a population of about 20,000, is a middle-class enclave roughly 20 miles east of Pittsburgh on U.S. Route 22.
CNN's Adrienne Zulueta contributed to this report