run, go. run. >> reporter: as police began surrounding the school, inside they say he continued shooting. using a shotgun and a resolver taken from his father. >> he's shooting. he's in the art room. shots fired right now, guys. >> they heard three shots and mr. vaughn said to run. everybody took off. i grabbed her and ran to the tree line. >> reporter: officials say pagourtzis was injured at some point. it's not clear how. he was eventually taken alive. >> the shooter has information contained on his computer and cell phone that he said not only did he want to commit the shooting but wanted to commit suicide after the shooting. as you probably know, he gave himself up. and admitted at the time he didn't have the courage -- >> reporter: officers cleared the building evacuating students and searching some. >> me and my friend ryan calvert ran so we could get shelter, and that's when i called my mom.