This is the second report of a school shooting within a week. On Tuesday, a seventh-grade student at Berrendo Middle School in Roswell, N.M., used a shotgun to fire three times in the gym before classes started, critically injuring an 11-year-old boy and 13-year-old girl.
Mason Campbell, 12, has been charged with three counts of aggravated assault with a deadly weapon in Tuesday's shooting, according to documents filed Wednesday at the Chaves County Fifth Judicial District Court. The charges are third-degree felonies.
Last month, a teenage gunman shot and killed a classmate at a Colorado high school. Karl Pierson, 18, initially arrived at Arapahoe High School on Dec. 13 looking for school librarian Tracy Murphy. He was carrying a 12-gauge shotgun, two Molotov cocktails and 125 rounds of ammunition. Pierson allegedly shot classmate Claire Davis, 17, soon after entering the school before trying and failing to shoot Murphy, police said. Pierson then turned his weapon on himself and was later found dead from a gunshot wound. Davis died on Dec. 21 from her injuries.
The Arapahoe shooting took place on the eve of the first anniversary of the Sandy Hook Elementary School shooting in Newtown, Conn., in which 27 people -- most of them first-graders -- were killed.
ABC News' Philadelphia affiliate WPVI contributed to this report.