The US Secret Service National Threat Assessment Center (NTAC) says there is no profile of a potential student attacker or the type of school attacked. “There’s not a certain age [or] a certain characteristic,” says Dr. Phil, explaining that the NTAC also says shooters have multiple motives. Continuing, he says, “Most attackers use firearms, and they get them from home – even if they’re locked up.” Hear more about why the National Threat Assessment Center says it’s been difficult to develop a profile on school shooters in the video above. Then check your local listing to find out where you can watch Monday’s Dr. Phil, “Tragic School Shootings: Who is to Blame?” WATCH: Sheriff Says His Department Was Not Brought In To School Meetings With Alleged Oxford Shooter And His Parents TELL DR. PHIL YOUR STORY: Are you involved in a story making headlines?