LOS ANGELES—A 17-year-old boy was struck and killed by two vehicles during a gang-related assault on Aug. 21 in South Los Angeles on the outskirts of a party that included at least 150 people, authorities said. The death occurred shortly before 3 a.m. in the area of Avalon Boulevard and 62nd Street, according to Officer…

Soaring gang crime and drug dealing have put over 213,000 children and young people in the UK at risk of serious gang-related violence due to a toxic mixture of high crime levels in the community and low family incomes, a new study has shown. Five percent of all 11–17-year-olds in England are vulnerable to involvement…