US: California reels from back-to-back shootings that killed 18

A deadly rampage by a 67-year-old suspect in Northern California was likely an act of workplace violence, authorities said on Tuesday, offering fresh details about the second in back-to-back mass shootings that killed 18 people and horrified the nation.

In two separate shootings within three days, 11 people were killed at a Los Angeles-area dance hall and seven others were murdered at two farms in the seaside town of Half Moon Bay near San Francisco.

Authorities said they still were trying to determine motives for both shootings.

Preliminary evidence indicated that the massacre in Half Moon Bay was a case of workplace violence and that the gunman had used a legally-owned weapon. In the Southern California shootings, officials have declined to make any statement regarding a possible motive.

The suspects in both attacks are men of retirement age, much older than typical perpetrators of deadly mass shootings that have become routine in the United States.

On Monday, a gunman in Half Moon Bay opened fire on employees at Mountain Mushroom Farm, where he had previously worked, and Concord Farms, about a mile away.

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The suspect, 67-year-old Chunli Zhao, was taken into custody later after he was found sitting in his vehicle, parked outside a sheriff's station. Authorities said they believe he had come to surrender.

He killed seven and wounded one, and all of his victims were Hispanic and Asian Americans, San Mateo County Sheriff Christina Corpus told reporters on Tuesday.

"All of the evidence we have points to this being the instance of workplace violence," Corpus said.

Zhao had threatened a co-worker in the past, according to court records obtained by the San Francisco Chronicle. In 2013, a roommate and colleague at a San Jose restaurant sought and secured a restraining order after telling a judge that Zhao had assaulted him and made death threats, the newspaper reported on Tuesday. The court order is no longer in effect.

San Mateo County jail listed pending charges against Zhao as deliberate and premeditated murder, attempted murder in the first degree, and discharging a firearm with enhancement for "most violent felonies."

Zhao was expected to be formally charged on Wednesday and was due to make his first appearance in court at the Hall of Justice in Redwood City at 1.30pm on Wednesday.

In a statement on Tuesday, President Joe Biden renewed his call for Congress to ban assault weapons.

"Even as we await further details on these shootings, we know the scourge of gun violence across America requires stronger action," he said.

News of the Half Moon Bay shooting broke as detectives were still investigating the Saturday night shooting at Star Ballroom Dance Studio in Monterey Park, just east of downtown Los Angeles, which occurred in the midst of the predominantly Asian American city's Lunar New Year celebrations.

Authorities identified the gunman as Huu Can Tran, 72, and said he fatally shot 10 people and wounded 10 others at the Star Ballroom, where he was a frequent patron. An 11th person died in the hospital from their wounds.

Tran then drove to a second dance hall nearby, but was unable to inflict further damage because the club's operator wrestled his weapon away. He fled in a white cargo van.

Police cornered him about 12 hours later in Torrance, south of Los Angeles, and then he fatally shot himself.

Among the 11 victims were two fishermen from Taiwan, according to the Taiwanese consulate in Los Angeles, and multiple Chinese citizens, according to the Chinese consulate.

It ranked as the deadliest mass shooting ever in Los Angeles County, according to Hilda Solis, a member of the county Board of Supervisors.

By comparison, the 1984 massacre of 21 people at a McDonald's restaurant in San Diego stands as the greatest loss of life from a single California shooting.

The two latest shootings were also notable for the age of the suspects, one in his late 60s, another in his early 70s.

A database of 185 mass shootings between 1966 and 2022 maintained by the nonprofit Violence Project includes just one carried out by someone 70 or older - a retired miner who killed five people in Kentucky in 1981.

Los Angeles County Sheriff Robert Luna told reporters on Monday that investigators had collected 42 bullet casings and a large-capacity ammunition magazine from the dance studio.

He said a search of the suspect's mobile home in a gated senior-living community in the town of Hemet, 80 miles east of Los Angeles, turned up a rifle, electronic devices and other evidence to indicate that Tran was manufacturing homemade weapons silencers. Police seized hundreds of rounds of ammunition from the dwelling and a handgun from his vehicle.

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