Large crowds had filled the streets around Whittier Boulevard and Leonard Avenue, with cars sounding their horns and supporters carrying Mexican flags. The atmosphere changed rapidly when gunfire was heard at about 10pm.
Reports from the scene describe people running for cover, while others stopped to help an injured person before emergency services arrived. Police and ambulances later surrounded the area, and nearby streets were sealed off.
The four injured people were taken to hospital, but their conditions have not been made public.
Investigators have not said whether the shooting was connected to the match, the celebrations or a separate dispute. That distinction is important: no motive has been publicly established.
Police found victims in several locations along or close to Whittier Boulevard, but are treating the case as one shooting incident. Footage appearing to show a car performing a doughnut near the junction shortly before about three shots were heard is among the material being examined.
The incident should not be used to define the thousands of supporters who gathered peacefully. It does, however, underline the security challenge created by spontaneous street celebrations after major international fixtures.
The investigation will now focus on identifying those involved, establishing the sequence of events and clarifying the victims’ conditions. Authorities are also likely to review how crowds were managed around the junction as the match ended and celebrations intensified.
Future World Cup screenings and public gatherings in Los Angeles may face closer policing, traffic controls and earlier intervention around busy entertainment areas. The next key developments will be updates on those hospitalised and any announcement from investigators about arrests or a possible motive.