Not much information.
https://ktla.com/news/local-news/multiple-people-dead-after-shooting-in-orange-police/
Update April 1 – the Orange PD had a news conference this morning at 10 AM and gave very few details, saying the investigation was ongoing. They gave the name of the suspect but all victims were not identified. The suspect and victims had a personal and/or business relationship; it was not a random shooting. More information would be released later.
The shooting made the national news; some named the city of Orange, some just said south of Los Angeles or 5 miles from Disneyland.
