By SCOTT BAUER, MIKE BALSAMO and MIKE HOUSEHOLDER

WAUKESHA, Wis. (AP) — Investigators are examining whether the person who drove an SUV through a Christmas parade in suburban Milwaukee may have been fleeing from a crime when he crashed into the paradegoers, a law enforcement official briefed on the matter told The Associated Press.

The investigators were questioning a person in custody about that incident, which the official described as an altercation involving a knife.

The official, who cautioned the investigation was still in the early stages and was continuing to develop, could not discuss the investigation publicly and spoke to the AP on condition of anonymity.

The city of Waukesha posted on its social media accounts that it could confirm at least five died and more than 40 were injured at the Sunday parade, while noting that it was still collecting information.

THIS IS A BREAKING NEWS UPDATE. AP’s earlier story follows below.

WAUKESHA, Wis. (AP) — A joyous scene of marching bands and children dancing in Santa hats and waving pompoms turned deadly in an instant, as an SUV sped through barricades and into a Christmas parade in suburban Milwaukee, killing at least five people and injuring more than 40 others.

One video showed a woman screaming, “Oh my God!” repeatedly as a group of young dancers was struck Sunday. A father talked of going “from one crumpled body to the other” in search of his daughter. Members of a “Dancing Grannies” club were among those hit.

The city of Waukesha posted on its social media accounts late Sunday that it could confirm at least five died and more than 40 were injured, while noting that it was still collecting information. The city’s statement also noted that many people took themselves to hospitals. The city did not release any additional information about those who died.

A “person of interest” was in custody, Waukesha Police Chief Dan Thompson said, but he gave no details about the person or any possible motive. The investigation was ongoing, with assistance from the Wisconsin Department of Justice.

“What took place in Waukesha today is sickening, and I have every confidence that those responsible will be brought to justice,” Attorney General Josh Kaul, the state’s top law enforcement officer, tweeted.

The horror was recorded by the city’s livestream and onlookers’ cellphones. One video shows the moment the SUV broke through the barricades and the sound of what appears to be several gunshots. Thompson said a Waukesha police officer fired his gun to try to stop the vehicle. No bystanders were injured by the gunfire, and Thompson said he did not know if the driver was struck by the officer’s bullets.

Another video shows a young child dancing in the street as the SUV speeds by, just a few feet from her, before it hurtles into parade participants a few hundred feet ahead. One video, of dancers with pompoms, ends with a group of people tending to a girl on the ground.

“There were pompoms and shoes and spilled hot chocolate everywhere. I had to go from one crumpled body to the other to find my daughter,” Corey Montiho, a Waukesha school district board member, told the Milwaukee Journal Sentinel. “My wife and two daughters were almost hit. Please pray for everybody. Please pray.”

The Milwaukee Dancing Grannies posted on its Facebook page early Monday that some of its members were among the dead. The group’s profile describes them as a “group of grannies that meet once a week to practice routines for summer and winter parades.”

“Our group was doing what they loved, performing in front of crowds in a parade putting smiles on faces of all ages, filling them with joy and happiness,” the post said.

“Those who died were extremely passionate Grannies. Their eyes gleamed … joy of being a Grannie. They were the glue … held us together.”

A Catholic priest, multiple parishioners and Waukesha Catholic schoolchildren were among those injured, the Archdiocese of Milwaukee spokeswoman Sandra Peterson said.

Chris Germain, co-owner of the Aspire Dance Center studio, had about 70 people in the parade ranging from as young as 2 being pulled in wagons to age 18. Germain, whose 3-year-old daughter was in the parade, said he was driving at the head of their entry when he saw a maroon SUV that “just blazed right past us.” A police officer ran past in chase. Germain said he jumped out of his own SUV and gathered the girls who were with him to safety.

Then he walked forward to see the damage.

“There were small children laying all over the road, there were police officers and EMTs doing CPR on multiple members of the parade,” he said.

Angelito Tenorio, a West Allis alderman who is running for Wisconsin state treasurer, said he was watching the parade with his family when they saw the SUV come speeding into the area.

“Then we heard a loud bang,” Tenorio said. “And after that, we just heard deafening cries and screams from the crowd, from the people at the parade. And people started rushing, running away with tears in their eyes, crying.”

The Waukesha school district canceled classes Monday and said in a notice on its website that extra counselors would be on hand for students and staff. The parade’s list of entries included cheer, dance and band entries associated with district schools.

Gov. Tony Evers said he and his wife, Kathy, were “praying for Waukesha tonight and all the kids, families, and community members affected by this senseless act.”

President Joe Biden was briefed Sunday night, White House press secretary Jen Psaki said on Twitter. Assistance is being offered to local officials, she said, and “Our hearts are with the families and the entire community.”

The parade, held each year on the Sunday before Thanksgiving, is sponsored by the city’s Chamber of Commerce. This year’s, the 59th, had the theme of “comfort and joy.”

Waukesha is a western suburb of Milwaukee, and about 55 miles (90 kilometers) north of Kenosha, where Kyle Rittenhouse was acquitted Friday of charges stemming from the shooting of three men during unrest in that city in August 2020.

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Bauer reported from Madison, Wis. Associated Press writer Doug Glass contributed from Minneapolis.

By LAURAN NEERGAARD and MATTHEW PERRONE

WASHINGTON (AP) — U.S. regulators on Friday moved to open up COVID-19 booster shots to all adults, expanding the government’s campaign to shore up protection and get ahead of rising coronavirus cases that may worsen with the holidays.

Pfizer and Moderna announced the Food and Drug Administration’s decision after at least 10 states already had started offering boosters to all adults. The latest action stands to simplify what until now has been a confusing list of who’s eligible by allowing anyone 18 or older to choose either company’s booster six months after their last dose — regardless of which vaccine they had first.

But there’s one more step: The Centers for Disease Control and Prevention must agree to expand Pfizer and Moderna boosters to even healthy young adults. Its scientific advisers were set to debate later Friday.

If the CDC agrees, tens of millions more Americans could have three doses of protection ahead of the new year. Anyone who got the one-dose Johnson & Johnson vaccine can already get a booster.

All three COVID-19 vaccines used in the U.S. offer strong protection against severe illness including hospitalization and death without boosters, but protection against infection can wane with time. Previously, the government had cleared boosters of Pfizer and BioNTech’s vaccine, as well as the similar Moderna vaccine, only for vulnerable groups including older Americans and people with chronic health problems.

But Pfizer last week asked the FDA to expand that decision to everyone, citing new data from a study of 10,000 people. Ultimately, the FDA decided there was enough evidence, from studies and real-world use of boosters, to back the expansion for both Pfizer and Moderna.

“Streamlining the eligibility criteria and making booster doses available to all individuals 18 years of age and older will also help to eliminate confusion about who may receive a booster dose and ensure booster doses are available to all who may need one,” FDA vaccine chief Dr. Peter Marks said.

The move to expand comes as new COVID-19 cases have climbed steadily over the last two weeks, especially in states where colder weather is driving people indoors.

Sparked by those worrying trends, some states didn’t wait for federal officials to act. Utah and Massachusetts were the latest states to announce in the past week that they’re opening boosters to all adults.

Boosters for everyone was the Biden administration’s original goal. But in September, a panel of FDA advisers voted overwhelmingly against that idea based on the vaccines’ continued effectiveness in most age groups. Instead they endorsed an extra Pfizer dose only for the most vulnerable.

Last month, backed by its advisory panel, the FDA cleared Moderna boosters — using half the dose that people received with the first two shots — for the same vulnerable groups.

But there has been some frustration inside the White House and among allies of the president that the long and public regulatory process contributed to misinformation and confusion around the boosters and potentially means the nation won’t be optimally protected heading into the holiday season.

Administration officials, including Dr. Anthony Fauci, continued making the case for using boosters more widely, noting that even milder infections in younger people can cause “long COVID” and other complications.

“I don’t know of any other vaccine where we only worry about keeping people out of the hospital,” said Fauci at a briefing Wednesday.

But the administration had pledged that ultimately the decision would fall to scientists. This time around, the FDA didn’t consult its advisers, saying scientific issues surrounding Pfizer’s and Moderna’s boosters “do not raise questions that would benefit from additional discussion.”

Regulators concluded the overall benefits of added protection outweighed risks of rare side effects from Moderna’s or Pfizer’s vaccine, such as a type of heart inflammation seen mostly in young men.

Pfizer and its German partner BioNTech argued that broader boosters could help tamp down infections at a critical period.

“We have absolutely no chance in the current situation to control the pandemic without providing boosters to everyone,” BioNTech CEO Ugur Sahin told reporters during a visit to Washington last week.

The companies studied 10,000 adults of all ages and found that a booster restored protection against symptomatic infections to about 95% even while the extra-contagious delta variant was surging. It’s too soon to know if that high level of protection will last longer after a third shot than after the second, something Sahin said the companies will carefully track.

Backing up that evidence, Britain released real-world data showing the same jump in protection once it began offering boosters to middle-aged and older adults. Israel has credited widespread boosters for helping to beat back another wave of the virus in that country.

More than 195 million Americans are fully vaccinated, defined as having received two doses of the Pfizer or Moderna vaccines or the single-dose Johnson & Johnson vaccine. More than 30 million already have received a booster.

Before the expansion, people who received the Pfizer or Moderna vaccinations were eligible for a third dose if they’re elderly or at high risk of COVID-19 because of health problems or their jobs or living conditions. Because a single J&J shot hasn’t proven as effective as its two-dose competitors, any J&J recipient can get a booster at least two months later.

But people who don’t meet the criteria can score an extra shot because many vaccine sites don’t check qualifications.

The FDA previously ruled that people getting a booster can receive a different brand from the vaccine they received initially.

Some experts worry that all the attention to boosters may harm efforts to reach the 60 million Americans who are eligible for vaccinations but haven’t gotten the shots. There’s also growing concern that rich countries are offering widespread boosters when poor countries haven’t been able to vaccinate more than a small fraction of their populations.

“In terms of the No. 1 priority for reducing transmission in this country and throughout the world, this remains getting people their first vaccine series,” said Dr. David Dowdy of Johns Hopkins Bloomberg School of Public Health.

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Associated Press Writer Zeke Miller contributed.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.