Several victims are said to remain in critical condition following Wednesday’s stabbing rampage at a Pennsylvania high school. A teenage suspect is accused of moving through the school, slashing and stabbing his classmates with kitchen knives. Twenty-one students and a security guard were injured. Murrysville Police Chief Tom Seefeld described arriving at the scene.

Tom Seefeld: “When we got there, there was a hallway that was pretty much in chaos, as you can imagine, a lot of evidence of blood on the floors in the hallway. We had students running about, trying to get out of the area. So, subsequently, upon checking and seeing what we had, immediate calls were put out to EMS [Emergency Medical Service].”

Several victims remain hospitalized with life-threatening injuries. Vigils were held for the injured on Wednesday night.