Shots Fired at a Middle School in the Southwest And we are all looking for answers once again, tonight, on another school shooting. This time, a seventh grader with a shotgun. But this is also the story of some courageous school officials who convinced a 12-year-old boy to put that gun down. Hauntingly familiar pictures pouring in from roswell, new mexico. Everyone reacting to the shock of this day. And abc's clayton sandell has the latest details right now. Reporter: The school day started with gunfire. We have one student, a female subject, possibly shot. Reporter: Police say a 12-year-old boy, brought a shotgun to his school in roswell, new mexico, opening fire in the gym. Two students, a boy and a girl, were shot. The shooter was quickly stopped by one staff member, who walked right up to him and asked him to set down the firearm. Reporter: A state police lieutenant, who was dropping off his own child, came running to help. It's one thing for an armed state police officer to enter a school and do his or her job. I commend the principal and people that work at this school, for saving many more lives. Reporter: Police say they don't know why the seventh grade suspect began shooting. His victims, a 13-year-old girl and 11-year-old boy, flown to a hospital in nearby lubbock, texas. She is in serious condition. He is critical, after emergency surgery. Keep these two children in your prayers. Who were shot while simply sitting in their gym, waiting to go to class. Reporter: Frantic parents came racing to find and hug their terrified kids. Deja vu in a country where school shootings are no longer rare. Today's shooting comes barely a month after a student opened fire at this high school in colorado. 17-year-old claire davis was killed. And since the massacre at sandy hook elementary, where 20 students and 6 teachers were murdered in connecticut, by 1 count, there's been 30 more school-related shootings around the country. Officials say today's shooting began and ended in only ten seconds. But the search for answers will go on much longer. Clayton sandell, abc news, denver.