In Southern California, Vice President Kamala Harris visited the Star Ballroom Dance Studio in Monterey Park Wednesday, where she laid flowers at a memorial for victims of Saturday’s massacre. Investigators say the shooter did not personally know any of the 11 people killed and nine others injured in the attack. All of the victims were Asian, and most were Chinese Americans. The shooter was a 72-year-old gun enthusiast who in 1999 lawfully purchased the semiautomatic MAC-10 assault pistol used in the killings.