The FBI says it is investigating a “targeted terror attack” in Colorado after a man reportedly threw petrol bombs at a pro-Israel event.

FBI boss Kash Patel said agents were working with local law enforcement on the scene in Boulder.

Witnesses told US media the attacker threw Molotov cocktails at people doing a walk to remember Israeli hostages in Gaza.

A male suspect is in custody.

Local police said there were “multiple victims” and a large part of the downtown area around Pearl Street was cordoned off.

Police chief Steve Redfearn said it happened around 1.26pm local time and initial reports were that “people were being set on fire”.

He said some victims were in hospital and injuries ranged from “very serious” to “more minor”.

“When we arrived we encountered multiple victims that were injured, with injuries consistent with burns,” Mr Redfearn told the media.

He said a suspect had been pointed out and taken into custody without incident.

“This area is not safe yet and we’re dealing with a vehicle of interest,” he added.

Mr Redfearn said it happened as a “group of pro-Israel people” were peacefully demonstrating, but that he couldn’t confirm a specific group had been targeted.

The police chief said it was too early to call it a “terror attack”. However, Colorado’s governor did use those words.

Jared Polis said on Facebook it was “unfathomable that the Jewish community is facing another terror attack here”.

A joint statement from Boulder’s Jewish community said “an incendiary device was thrown at walkers at the Run for Their Lives walk on Pearl Street as they were raising awareness for the hostages still held in Gaza”.

It added: “Our hearts go out to those who witnessed this horrible attack, and prayers for a speedy recovery to those who were injured.”

Colorado attorney general Phil Weiser said it “appears to be a hate crime” and that “violence is never the answer to settling differences”.

His statement said the group affected gathered weekly on Pearl Street to call for the release of the remaining hostages held by Hamas.

Boulder is a university city of about 105,000 people on the northwest edge of Denver, in the foothills of the Rocky Mountains.

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The attack follows the arrest of a Chicago-born man in the fatal shooting of two Israeli embassy employees in Washington DC two weeks ago.

Tensions are simmering in the US over Israel’s war in Gaza.

There has been an increase in antisemitic hate crime, as well as moves by some supporters of Israel to brand pro-Palestinian protests as antisemitic.

President Trump’s administration has detained protesters without charge and pulled funding from elite universities that have permitted such demonstrations.

A 16-year-old transgender athlete who is the focus of a US sports row has won two golds and a silver at the California high school track and field championship.

AB Hernandez was born a boy but has transitioned and now competes against girls.

And the teenager’s inclusion in the girls category in the high jump, long jump and triple jump became a national conversation.

Critics, including parents, conservative activists and President Trump, had called for Hernandez to be barred from competing.

Who is AB Hernandez?

In the city of Clovis on Saturday, she took part under a new rule change brought in by the state’s interscholastic federation, under which an extra student was allowed to compete and win a medal in the events where Hernandez qualified.

And it meant there were two winners when she finished first.

Hernandez shared first place in the high jump with Jillene Wetteland and Lelani Laruelle.

All three cleared a height of 5ft 7in (1.7m), but Hernandez had no failed attempts, while the other two had each logged one failure.

Hernandez also had a first-place finish in the triple jump, sharing the top spot with Kira Gant Hatcher, who trailed her by more than half a metre.

Also, Hernandez came second in the long jump with Brooke White.

“Sharing the podium was nothing but an honour,” White said. “As a part of the queer community I want AB Hernandez to know we all have her back.”

Plane protest

During Hernandez’s qualifying events on Friday, a plane flew over the stadium trailing a banner, which read: “No boys in girls’ sports.” It was organised and paid for by two women’s advocacy groups.

A small protest also took place on the road outside. “Save girls’ sports,” one poster read. “XX does not equal XY,” read another.

Transgender inclusion is a thorny issue but a vote winner for Donald Trump, who campaigned last year with a promise to “kick out men from women’s sport”.

He signed an executive order seeking to ban transgender women from female sports.

And Mr Trump has threatened to withdraw federal funding from California over Hernandez’s participation in this weekend’s athletics event.

‘Pilot entry process’

The California Interscholastic Federation had earlier said it was launching a “pilot entry process” to allow more girls to participate in the championship.

It only applied to the three events in which Hernandez competed.

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The rule change may be the first attempt nationally by a high school sports governing body to expand competition when trans athletes are participating.

If a transgender athlete wins a medal, their ranking would not displace a “biological female” student from also medalling, the federation confirmed, and it will be reflected in the records.

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The federation said the rule opens the field to more “biological female” athletes.

The organisation did not specify how it defines “biological female” or how it would verify whether a competitor meets that definition.

Donald Trump said he plans to double tariffs on steel imports from next week, deepening his trade war which has hit global markets.

The US president told a rally of steel workers in West Mifflin, Pennsylvania, on Friday that tariffs would be raised from 25% to 50%, “which will even further secure the steel industry in the United States”.

Mr Trump later said on Truth Social that the new levy – also affecting aluminium imports – would be in effect from Wednesday and that American “industries are coming back like never before”.

“This will be yet another BIG jolt of great news for our wonderful steel and aluminum (sic) workers,” he added. “MAKE AMERICA GREAT AGAIN!”

He then said: “We don’t want America’s future to be built with shoddy steel from Shanghai – we want it built with the strength and the pride of Pittsburgh!”

Sky News understands that British steel exports are exempt from this rise after a UK-US trade agreement was signed earlier this month.

The agreement said at the time that the US “will promptly construct a quota at most favoured nation (MFN) rates” for British steel, aluminium and derivative products.

Read more: Key details in the UK-US ‘historic’ trade deal

Earlier, the US president claimed China had “totally violated” an agreement to mutually roll back tariffs and trade restrictions for critical minerals.

“So much for being Mr Nice Guy,” he said in a post on his social media platform.

In March, Mr Trump introduced a 25% tariff on all foreign steel and aluminium imports as a way to protect US manufacturing and bolster jobs by making foreign-made products less attractive.

The rates threaten to make the cost of products using steel and aluminium – such as cars or soft drink cans – more expensive for Americans.

He also previously threatened Canada with 50% levies on imports, while the provincial government of Ontario, in turn, threatened to charge 25% more for the electricity it supplies to the US.

Canada’s most populous province provides electricity to more than 1.5 million American homes and businesses in Minnesota, New York and Michigan.

At the time, Canadian Prime Minister Mark Carney called the proposed 50% tariffs an “attack” on Canadian workers, families and businesses.

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Roughly a quarter of all steel used in the US is imported, with a majority coming from Mexico, Canada, Japan, South Korea and Germany.

In 2024, 6.6m tonnes of steel were imported by the US from Canada, while 3.5m tonnes were brought in from Mexico.

The US is also reliant on imports for aluminium, with 3.2m tonnes coming from Canada last year.