MONTEREY PARK, Calif. (AP) – In the wake of the worst massacre in Los Angeles County history, the California governor was meeting gunshot victims in the hospital when he was pulled away and briefed on a mass shooting at the other end of the state.

Word that a gunman had killed seven people at mushroom farms in a scenic coastal stretch of Northern California came just hours after Governor Gavin Newsom spoke of his fatigue and frustration with mass shootings.

“I can’t keep doing them,” he told reporters earlier Monday in Monterey Park, where 11 people were killed at a dance studio. “Saying the same thing over and over and over again, it’s insane.”

Yet Mr. Newsom was in Half Moon Bay on Tuesday to address the third mass shooting in just over a week in a state with some of the nation’s toughest gun laws and lowest gun death rates.

His voice brimming with anger and emotional at times, Mr. Newsom said he consulted notes he used at past mass shootings: the slaying of 12 at a Thousand Oaks country and western bar in 2018; the killing of three and wounding of 17 at the 2019 Gilroy Garlic Festival; the slaying of nine workers at a San Jose rail yard in 2021.

“I started writing in ‘Monterey Park,’” Mr. Newsom said. “And now I gotta write in, ‘Half Moon Bay.’ What the hell is going on?”

A 66-year-old farmworker was booked on murder and attempted murder charges after shooting eight people, killing seven, in a crime authorities said was a case of workplace violence in the rich agricultural area that lies between the Pacific Ocean and coastal mountains.

In Monterey Park, a 72-year-old gunman shot up a dance hall in an Asian American community that had been celebrating Lunar New Year’s Eve on Saturday night, wounding nine people in addition to the 11 killed. The gunman later took his own life.

A week earlier, at least two assailants fatally shot a 16-year-old mother clutching her 10-month-old baby, and killed four others in a brazen attack in a central California farming community that remained unsolved.

“Our hearts are with the people in California,” President Joe Biden said Tuesday at a meeting with congressional leaders. “They’ve been a rough, rough couple of days.”

Mr. Biden noted that Sen. Dianne Feinstein had introduced an assault weapons ban, and he urged lawmakers to pass it.

Mr. Newsom also called for stronger gun safety laws and took particular aim at the large capacity magazines—like the one the dance studio gunman had—and what he called “weapons of damn war.”

“It’s said all the time: ‘Only in America,’ “he said. “No. 1 in gun ownership, No. 1 in gun deaths. It’s not even complicated.”

The recent slayings moved California up five slots to 26th place on the number of fatal mass shootings per capita in the U.S. since 2006, according to a USA TODAY/AP/Northeastern University mass killing database. The database only counts killings of at least four people.

While California has the highest number of fatal mass shootings—49, including the recent three—it had ranked 31st beforehand when adjusted for being the nation’s most populous state with nearly 40 million residents.

The U.S. Centers for Disease Control and Prevention lists California as having the 7th lowest gun mortality rate in the country per 100,000 residents, according to the most recent statistics available from 2020. It’s the 20th lowest in terms of homicide rate, which is not limited to shootings.

With the back-to-back killings, detectives at both ends of the state were trying to answer the question that often goes unanswered in the face of senseless violence: Why?

Los Angeles Sheriff Robert Luna called the dance hall gunman a “mad man” and said investigators were looking into whether he had relationships with the people who were shot at the Star Ballroom Dance Studio.

The gunman fired 42 rounds at the ballroom popular with older Asian Americans. He then drove to another nearby dance hall where an employee wrested a modified 9 mm submachine gun-style weapon away from him, Mr. Luna said.

The shooter fatally shot himself Sunday as officers surrounded the van he was inside. A handgun was recovered from the van, which matched descriptions of the vehicle he used to get away from the dance studio.

Mounds of flowers, including dozens of yellow and white mums, were left in front of the studio’s closed gates Tuesday. On a brick column next to the gates someone taped a piece of blue paper with the typed “Ban Semi-automatic Rifles” and below it a translation in Chinese.

Hundreds of people turned out Tuesday evening for a candlelight vigil at the Monterey Park City Hall. Wooden hearts bore the names of victims. One woman helped her young daughter place flowers on the memorials. “There are so many,” she said, her voice shaking. “We won’t have enough.”

So far, there have been six mass killings this year in the U.S., and the Monterey Park shootings were the deadliest attack since May 24, when 21 people were killed in an elementary school in Uvalde, Texas.

The Half Moon Bay slayings came less than 48 hours later when another gunman shot five people at a mushroom farm where he worked, killing four, authorities said. He then drove to a farm where he once worked nearby, and fatally shot three other people.

The victims were Asian and Hispanic, and some were migrant workers.

One of the workers killed was Marciano Martinez Jimenez, 50, his brother, Servando Martinez Jimenez, told The Associated Press. He was from the Mexican state of Oaxaca and lived in the U.S. 28 years.

“He was a good person,” Martinez Jimenez said in Spanish. “He was polite and friendly with everyone. He never had any problems with anyone. I don’t understand why all this happened.”

The farm shootings were the largest mass killing in San Mateo County.

“We’ve never had one in this county of this many deaths at one scene or one time,” District Attorney Steve Wagstaffe said.

The shooter was arrested after officers found him in his car in the parking lot of a sheriff’s substation.

Mr. Newsom said he purposely avoided news conferences in Los Angeles to meet with residents of the community, people wounded by gunfire and a heroic citizen who disarmed the shooter.

While he was in Monterey Park, a teary-eyed mother rolled up in her car and asked Mr. Newsom to reassure her three daughters that everything was going to be OK. Her 8-year-old had heard the gunfire and knew it wasn’t firecrackers. She hadn’t slept at night and was afraid to go to school, the mother said.

Mr. Newsom told the girl, “It’s gonna get better.”

But in front of a group of dozens of politicians, law enforcement officers and reporters assembled in Half Moon Bay, he said he was relieved she didn’t make him lock pinky fingers and promise like his own 8-year-old daughter would. “Because I wasn’t so sure.”