A teenager was shot and killed during the opening game of a high school football season at Independence High School in California, prompting players, pupils and parents to flee. The incident turned a school sporting event into an emergency and is likely to raise concerns about safety at public gatherings involving young people.

The report identifies the victim as a teenager and says the shooting occurred during the season opener. Further details about the suspect, motive, exact circumstances and any arrests were not provided in the supplied article text.