The 72-year-old gunman who sprayed bullets into a Southern California ballroom dance hall, killing 11 people, had no known connection with the victims, the Los Angeles County sheriff said.
Los Angeles County Sheriff Robert Luna said investigators are still trying to determine a motive for the massacre.
Before the shooting on Saturday night, Huu Can Tran parked a motorcycle just a block away from the ballroom in Monterey Park, which investigators believe he had planned to use as a backup getaway vehicle, Luna said hours after police seized the motorcycle.
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Tran opened fire on a mostly elderly crowd of dancers at the Star Ballroom Dance Studio, killing 11 people and wounding nine, police said.
The carnage, during what should have been joyful Lunar New Year celebrations, sent ripples of fear through Asian American communities already dealing with increased hatred and violence directed at them.
Some reports had said Tran frequented the dance hall and fancied himself as an instructor, but Luna said he hadn't been there in at least five years and did not appear to target the victims specifically.
"We have not been able to establish a connection between the suspect and any of the victims thus far," Luna said.
Luna said it wasn't clear how long Tran had been planning the attack in the city about 8 miles (12.8 kilometres) from downtown Los Angeles or what prompted him to spray at least 42 bullets, taking time to reload his weapon, a variant of the MAC-10 semiautomatic machine pistol with a 30-round magazine.
Tran's motive continues to elude detectives days after the tragedy as they searched piles of items and paperwork seized from Tran's home and a van he used to flee, the sheriff said.
"It doesn't make sense," Luna said. "It really doesn't."
About 20 minutes after the carnage in Monterey Park, Tran entered another dance hall about 3.5 miles (5.6 kilometres) away in Alhambra, where an employee confronted and disarmed him during a brief struggle. Tran later shot himself in the van where his body was found Sunday morning.
Tran, who was of Vietnamese descent and lived in Hong Kong, had been in the U.S. for seven or eight years. He bought the machine pistol in Monterey Park in 1999 but it was not registered in California, the sheriff said. The gun and the high-capacity magazine are illegal in California.
Luna said Tran used a registered semiautomatic handgun when he died by suicide, and a registered bolt-action rifle was found at his home in Hemet, about 70 miles (112 kilometers) from Monterey Park. His only known criminal history was a 1990 arrest for unlawful possession of a firearm but there was no indication of a conviction.
The shooting at 10:22 pm on Saturday occurred just an hour or so after tens of thousands of people attended Lunar New Year festivities in the city.
Less than 48 hours later, a gunman in Northern California shot eight fellow farmworkers, killing seven, at mushroom farms in Half Moon Bay. The shooter was of Chinese descent and most of the victims were Asian.
Outside the locked gates of in Monterey Park's Star Dance Studio, a memorial grew higher with mounds of bouquets and balloons. Hundreds of people carrying flowers, candles and incense showed up for a vigil.
Vice President Kamala Harris visited the memorial on Wednesday, adding her own bouquet, before heading to a senior centre to talk to relatives of the victims. She paused in front of each of the large, rose-framed placards that contained photos or names of the victims at the memorial.
Speaking briefly to reporters, Harris relayed sentiments on behalf of President Joe Biden and called for Congress to enact stricter gun control laws.
"Tragically we keep saying the same things," Harris said. "Can they do something? Yes. Should they do something? Yes. Will they do something? That is where we all must speak up."
Pope Francis was among those offering condolences, saying in a message to the Los Angeles archbishop that he "implores the divine gifts of healing and consolation upon the injured and bereaved."
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