Los Angeles – An 18-year-old was killed in a shooting on the sidelines of a high school graduation party in the US state of California. Three other people, ages 11, 20 and 25, were injured in the incident in Fairfield, northwest of San Francisco, on Wednesday evening, police said. A participant in the graduation ceremony told television station KCRA that the shots were fired in the school’s parking lot while photos of the graduates were being taken there.