Earlier on Sunday police surrounded the van with tactical vehicles and bomb squad trucks.
Sherriff Luna said the earlier shooting at the Star Ballroom Dance Studio in Monterey Park left five women and five men dead and wounded another 10 people.
Then 20 to 30 minutes later, a man with a gun entered the Lai Lai Ballroom in nearby Alhambra.
Authorities believe the two events are connected but have offered no details about a motive.
The suspect entered the Alhambra club with a gun, and people wrested the weapon away from him before he fled, Mr Luna said.
The shooting sent a wave of fear through Asian American communities in the Los Angeles area and cast a shadow over Lunar New Year festivities around the country. Other cities sent extra officers to watch over the celebrations.
The massacre was the nation’s fifth mass killing this month.
Monterey Park is a city of about 60,000 people on the eastern edge of Los Angeles and is composed mostly of Asian immigrants from China or first-generation Asian Americans.
The shooting happened in the heart of the city centre where red lanterns decorated the streets for the Lunar New Year festivities. A police car was parked near a large banner that read “Happy Year of the Rabbit!”
The celebration in Monterey Park is one of California’s largest and had attracted tens of thousands of people throughout the day.
Two days of festivities, which have been attended by as many as 100,000 people in past years, were planned. But officials cancelled Sunday’s events following the shooting.
The White House said US president Joe Biden had been briefed on the situation by homeland security adviser Elizabeth Sherwood-Randall.
Porn star Stormy Daniels has described to jurors an awkward and unexpected sexual encounter she claims she had with Donald Trump in 2006.
Ms Daniels was testifying at the former president’s criminal trial over hush money she was paid to keep silent about the alleged encounter during the presidential race.
Ms Daniels, 45, said she tried not to think about having sex with him while it was allegedly taking place.
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Stormy Daniels recalls bedroom encounter with Trump
Mr Trump, 76, stared straight ahead when she entered the courtroom and occasionally shook his head and whispered to his lawyer.
After the lunch break, Mr Trump’s defence lawyers demanded a mistrial over what they said were prejudicial and irrelevant comments.
The judge rejected the defence’s request and said defence lawyers should have raised more objections during the testimony.
Later in the day, the Trump team used its opportunity to question Ms Daniels to paint her as motivated by personal hatred of the former president and hoping to profit off her claims against him.
“Am I correct that you hate President Trump?” defence lawyer Susan Necheles asked.
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“Yes,” Ms Daniels acknowledged.
Hush money payment
In the final weeks of Mr Trump’s 2016 Republican presidential campaign, his then-lawyer and personal fixer Michael Cohen paid Ms Daniels $130,000 (£103,000) to keep quiet about what she described as an awkward and unexpected sexual encounter with Mr Trump at a celebrity golf outing in Lake Tahoe in July 2006.
Mr Cohen pleaded guilty to campaign finance violations in 2018 related to the payments and served more than a year in prison – with federal prosecutors saying he acted at Mr Trump’s direction.
Mr Trump, the Republican candidate for president again this year, has pleaded not guilty to charges of falsifying business records to cover up the payment and denies having sex with Ms Daniels.
Imbalance of power
Ms Daniels described how an initial meeting at the golf tournament, where they discussed the adult film industry, progressed to a “brief” sexual encounter she said Mr Trump initiated after inviting her to dinner and back to his hotel suite.
She said she did not feel physically or verbally threatened during the encounter, but she perceived an imbalance of power, with Mr Trump being “bigger and blocking the way”.
She said she found it “hard to get my shoes” after it ended “because my hands were shaking so hard”.
“He said, ‘Oh, it was great. Let’s get together again, honey bunch’,” Ms Daniels said. “I just wanted to leave.”
Mr Trump has been charged with 34 felony counts of falsifying business records in connection with the hush money payments.
Speaking outside of court at the end of the day, Mr Trump said: “This was a very big day, a very revealing day. As you see their case is totally falling apart.”
Ms Daniels is expected to return to the witness stand when the trial resumes tomorrow.
There are moments, more than others, that scream the humiliation of it all.
Take this, before Tuesday’s proceedings got underway. “No descriptions of genitalia or anything but it’s important to elicit that she had sex with him.”
It was the prosecution’s assurance prior to questioning Stormy Daniels after Donald Trump’s lawyers had objected, in advance, to her testifying to the details of sexual acts.
It would be that kind of day in this kind of trial.
In a dingy New York courtroom, this was the president and the porn star, together again, in a reunion most reductive for Mr Trump.
He might have secured guarantees on anatomical detail but, from the moment the court heard “The People call Stormy Daniels” this was Mr Trump with his trousers down, no doubt.
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Ms Daniels told her story, of growing up in Baton Rouge, Louisiana, the daughter of a single mother. She edited her high school newspaper, enjoyed ballet dancing and horses and had ambitions to be a technician.
By the time she met Mr Trump, aged 27, we learned she was an adult film actress and director, star of the likes of 40-Year-Old Virgin and Knocked Up.
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By her telling, the Trump encounter was more Austin Powers – the penthouse suite, the satin pyjamas and the spanking with a rolled-up magazine.
“Bullshit,” Mr Trump was heard to mutter. His problem is that this kind of bullshit sticks.
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Stormy Daniels recalls bedroom encounter with Trump
Whatever his lawyers’ protestations about Ms Daniels’ credibility – and there are holes – that’s hardly the headline for a watching, voting, public.
What will they take from court to the polling booth in November? Quite apart from the imagery, what message does it send to key demographics?
An affair with a porn star, whilst married, is a poor fit with the principles of evangelicals, so critical to the Trump vote in 2016. Suburban women might also reel from this tawdry peek backstage at the presidency.
How much will Mr Trump worry? About $130,000 (£103,000) worth. It is the premium he paid to stop the story coming out in the first place.
Sadly, for him, the insurance policy has run out.
After a night with the porn actor, it’s the hard-core consequences.
Grease star Susan Buckner, who played Patty Simcox in the classic musical, has died aged 72.
The American actress died peacefully on Thursday 2 May surrounded by her loved ones, publicist Melissa Berthier has said.
A cause of death has not been given.
Buckner was best known for her role in Grease where she played the Rydell High cheerleading pal of Sandy – played by Olivia Newton-John.
In a memorable scene, Bucknell gives a rallying cry for the school when she says: “Do the splits, give a yell, show a little spirit for Old Rydell! Way to go, red and white, go Rydell, fight, fight, fight.”
Bucknell’s daughter Samantha Mansfield said after her mother’s death: “She was magic. She was my best friend. And I will miss her every day.
“I was lucky I had such a lighting rod of a mother and now I have her as an angel.”
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Born in Seattle, Buckner made her name on the pageant circuit, being crowned Miss Washington in 1971 before representing the state at the Miss America competition the following year.
She channelled her experience into the entertainment industry, becoming a member of the singing and dancing group The Golddiggers, which featured on The Dean Martin Show.
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She also made appearances on The Mac Davis Show, Sonny And Cher, and The Brady Bunch Variety Hour.
Following her appearance in Grease in 1978, Buckner starred in TV shows including The Love Boat, BJ And The Bear, The Hardy Boys/Nancy Drew Mysteries, and When The Whistle Blows.
She also starred in the 1981 Wes Craven horror film Deadly Blessing alongside Sharon Stone, as well as in Police Academy 6: City Under Siege in 1989.
Buckner later took a step back from Hollywood and became a mother to her two children, Adam Josephs and Mrs Mansfield.
She is also survived by her grandchildren Oliver, Riley, Abigail and Ruby as well as her sister Linda, daughter-in-law Noel Josephs, son-in-law Adam Mansfield and longtime partner Al.