This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.BROOMFIELD, Colo. — A 14-year-old girl was stabbed in the back by a 14-year-old male fellow student at Aspen Creek K-8 school on Thursday morning, the Broomfield Police Department said. The girl was airlifted to Children’s Hospital in Aurora in a Flight for Life helicopter in stable condition. Broomfield police said the incident happened about 11:30 a.m. on the playground near swing sets during recess. The suspect was separated from the victim, and the principal was able to gain possession of the knife and detain him. “It sounds like it may be a serrated kitchen knife,” Broomfield police Sgt. Mark Goodell said. Broomfield police said it was an isolated incident and there was no reason to believe there is any more threats to the school or the city. The school, which is at 5500 Aspen Creek Drive near West 136th Avenue and Sheridan Boulevard, was placed on lockout after the incident, Boulder Valley School District spokesman Briggs Gamblin said. Students arrived at the school, but school officials said classes will be let out at normal time.