The 12-year-old boy accused of firing a shotgun at classmates in his New Mexico middle school this week is in many ways an atypical school shooter, according to an ABC News examination of news stories about school shootings over the past year.

At 12, the boy is the youngest person accused of a school shooting in the past 13 months. But he is unusual in other ways, too…

In a majority of the cases studied, attacks took place outside, in the afternoon and with a handgun.

The accused 12-year-old who injured two students at his school in Roswell, N.M., used a shotgun and launched his attack inside the building just as the school day was starting.