CHICAGO (AP) — Police took steps on Tuesday to stave off retaliatory attacks by street gangs after a Chicago rapper known for taunting rivals on social media was shot in the head in a shootout during a funeral for his friend and a fellow rapper killed earlier in October.

Five others were injured in the Monday afternoon shooting, though none as seriously as 21-year-old rapper Marvel "FBG Wooski" Williams. Witnesses described hearing around 40 shots as two groups exchanged gunfire along a two-block stretch of a busy street on the city's South Side.

Police are monitoring threats of retaliation po...