26-year-old Gerry Dean Zaragoza killed his father and brother at home, fatally wounding a known woman at a gas station and shooting a man on a bus who died, police said.
There is no obvious motive for one of the murders, said Captain William Hayes of the Los Angeles Police Department robbery department.
"We rate it, we question witnesses, but we can." "I have no concrete answer," he told reporters.
Hayes said the shootings started around 1:20 am at Canoga Park when Zaragoza shot and killed his parents and brother. Zaragoza's father and brother were killed and his mother injured, Officer Greg Kraft said.
About an hour later, Zaragoza went to a gas station in North Hollywood, where he shot a woman and a man working there, Hayes said.
Hayes said Zaragoza knew the woman before. She died in a hospital. Hayes said the man survived; The police had previously said that the victim is in critical condition.
The police also believe that Zaragoza is responsible for an attempted robbery near an ATM in a bank and for a lethal shootout in a bus at a stop in Van Nuys.
"The guy … approached me and basically, when he came up to me, he still liked to pull the gun," said Carlos Hurtado de Jesus. "I started walk around in the bus and saw him finally go and put the gun away.
He was arrested by street clothes detectives at around 2 pm with a small fight, Hayes said.
Zaragoza had a gun captain said.
"We are deeply saddened by the loss of life and I have used my Crisis Response Team to help families affected by the tragedies," Mayor Eric Garcetti tweeted about the report.