CHARDON, Ohio (AP) - The teenager accused of killing three students in a shooting rampage in an Ohio high school cafeteria chose his victims at random and is "someone who's not well," a prosecutor said Tuesday as the slightly built young man appeared in juvenile court. He said Lane didn't know the victims. Lane will probably be charged with three counts of aggravated murder and other offenses, the prosecutor said. A thin figure with short dark hair, Lane seemed small next to the sheriff's deputies who led him into court, and said little more than "Yes, sir" in response to questions from the judge. The hearing came hours after the death toll rose to three, and as schoolmates and townspeople grappled with the tragedy and wondered what could have set off Lane, a young man described by other students as extremely quiet, with few if any friends. The court appearance did little to solve the mystery. Judge Timothy Grendell ordered the boy held for at least 15 days. Prosecutors have until Thursday to bring charges against him and are expected to ask that he be tried as an adult. Meanwhile, shaken residents extended condolences to the families of those killed and wounded at the 1,100-student high school, and grief counseling was offered to students, staff and others at area schools. Authorities on Tuesday said that students Demetrius Hewlin, 16, and Russell King Jr., 17, had died. Another student, Daniel Parmertor, died shortly after the shooting. Hewlin attended Chardon High. Both King and Parmertor were students at the Auburn Career Center, a vocational school, and were waiting in the Chardon High cafeteria for their daily bus when they were shot. But authorities would not say how and why ended up there. Kala Day, 18, said she rode the morning school bus with Lane and knew the victims. He always sat by himself and like looked out the window. So I sat with him a few times, because I felt bad for the kid. He didn't talk. He just stared out the window," she said. The shooting sent students screaming from the building in panic, and some of that chaos and fear was captured in 911 recordings released Tuesday. We just had a shooting at our school. We need to get out of here. Oh, my god," one crying female caller told a dispatcher. "Everyone's running away," the caller added. Another caller, a male student, instantly identified the gunman as Thomas Lane, a student, and said he appeared to be shooting at random. What was his beef with these kids? Do we know?" the dispatcher asked. "I have no idea," he said, adding: "He's very quiet and he doesn't really talk to anyone."