Newport Beach officials make more than 400 arrests after Fourth of July celebrations erupt into 36 hours of illegal fireworks, fights and looting tied to a social media "TikTok Takeover."Mayor Lauren Kleiman and Newport Beach Police say mostly young, out-of-state visitors and minors drove the unrest; videos show fireworks detonating near crowds, a person in a Spider-Man mask leading chants and the looting of a grocery store.The city triples fines in designated safety zones, announces a one-strike policy that can lead to short-term rental permit revocations, praises officers' response and plans a comprehensive safety review after one officer is injured by a mortar-style firework.