Image source, Getty Images

It's been about 24 hours since a gathering of demonstrators calling for the release of Israeli hostages in Gaza came under attack. Here is a reminder of what we know so far.

Mohamed Sabry Soliman was arrested at the scene, and has been accused of carrying out the attack. The FBI believes he acted alone.

Federal prosecutors have filed a hate crime charge against Soliman, who authorities say told investigators he been planning the attack for a year and acted because he wanted to stop what he calls the "Zionist" group.

State prosecutors have brought separate charges, including attempted murder in the first degree, the use of an incendiary device the attempted use of an incendiary device.

Soliman appeared in court to be read those charges today.

His home was also searched and investigators say they gathered digital evidence there.

Soliman is set to appear in court again on Thursday.

At a news briefing Monday afternoon, Boulder police said 12 people were injured in yesterday's attack. At least two have been airlifted to Aurora for treatment.

We still don't know many details about the victims.

There is also some uncertainty around Soliman's immigration status in the US.

Attorney General Pam Bondi, have described him as "an illegal alien", but officials from the Department of Homeland Security told the BBC that Soliman arrived in the US legally on a tourist visit in 2023. When that expired, he applied for asylum, they said.

We are closing our live coverage for now, but you can stay up-to-date here: Suspect in Colorado fire attack planned for a year, FBI says

Image source, Getty Images

As we've been looking at the suspect and the charges he faces, let's take a look back over what happened on Sunday, according to authorities.

Mohamed Soliman, the alleged attacker, arrived at a popular park in Boulder, Colorado at 12:55 local time.He waits for the Run for Their Lives group, who call for the release of Israeli hostages held by Hamas in Gaza.

Armed with Molotov cocktails and a makeshift flamethrower, police say he attacked the group at 13:26. Authorities say he shouted "free Palestine" during the attack.

Twelve people were injured, with at least one left in a critical condition. One local business owner ran to aid those injured by flames, bringing water to "put out the burns".

Officers arrived at the park at 13:30, and placed the suspect into custody at 13:32.

Colorado Governor Jared Polis has told the BBC he knows two of the victims of the Boulder attack personally.

"It would have been wonderful to have prevented this crime before it occurred," Polis tells the BBC's Caitríona Perry. In court documents, authorities said suspect Mohamed Soliman had allegedly planned the attack for a year.

"Absolutely the goal would be for federal law enforcement" and the FBI "to really track and investigate people, and (I) obviously wish that they'd've been successful in this case and prevented this from occurring," Polis says.

Polis says that he is reaching out to state law enforcement, and that Colorado has grants available to protect houses of worship such as synagogues, mosques, and churches from similar threats.

"The presence of physical protection is key, making sure that police and state troopers are in public gathering places, and people see that and have their comfort level," he says.

Polis, who is Jewish, calls for "bringing together voices from the left, the right, Muslim, Christian, Jewish, to in the outright condemnation of these kinds of terrorist acts", as the suspect faces federal hate crime charges.

Kayla Epstein
US reporter

Chapters of the Run For Their Lives group have held weekly walks and marches for more than a year and a half, since the conflict between Israel and Hamas began in October 2023. But chapters around the country are weighing how to advocate for the return of the remaining hostages held in Gaza since the conflict broke out amid their increased focus on their own safety after Sunday's attack.

Miri Kornfeld, who helps run the Run For Their Lives in nearby Denver, tells the BBC that they were considering partnering with a non-profit to fundraise for security going forward. Her chapter will continue discussions with local police about bolstering security during their weekly meetups, she says.

It is common for Jewish institutions and synagogues in the US to employ some form of security force, she notes.

"There will be something" to commemorate the attack and bolster the local community this week, she tells the BBC. "The community is going to come together for something. What that something looks like will depend on security."

Earlier this evening, we heard from former President Joe Biden who posted on social media condemning the attack.

"Jill and I are praying for the victims of the violent, targeted attack on the Jewish community in Boulder. We must stand united against antisemitic violence and hate," he wrote.

Kayla Epstein
US reporter

The group of people attacked in Boulder were participating in an event for Run for Their Lives, which advocates for the release of hostages held in Gaza after 7 October 2023.

Chapters around the country meet once a week to walk or run to draw attention to their cause. Between 21-24 of the remaining hostages are believed to still be alive.

Safety has always been a top priority for group chapters, Run for Their Lives Global Coordinator Shira Weiss says, but they "never thought such a violent attack would happen."

“The premise of the group is to peacefully raise awareness of the hostages. We’re apolitical, we’re not protesting anything," Weiss tells the BBC.

Weiss says she does not want to speculate about what motivated the alleged attacker. Court documents released on Monday allege that the suspect stated he wanted to "kill all Zionist people".

“We really drill into our leaders that we are not discussing politics," she continues.

"Politics are not brought up during the marches or the gatherings. We get people from all walks of life - who vote Republican, Independent, Democrat, who the Israeli government, or don’t the Israeli government."

"It's definitely shocking and disheartening and upsetting," Weiss says. "We are praying for all the victims, and hoping that we have a speedy recovery."

The hearing is over. Another one has been scheduled for Thursday afternoon for the filing of charges, where they said they would discuss bail.

Altogether the judge, suspect and attorneys met for two minutes by our count.

Soliman was wearing yellow overalls and had a white bandage across his head. He spoke from behind a glass wall, answering "yes" to questions meant to determine that he understood what was happening in the courtroom.

Colorado Judge Nancy Salomone is explaining procedural matters and the next legal steps at the Boulder County jail, where Soliman is being held.

She brings up the bail - we previously reported that prosecutors are setting it at $10m (£7.3m) - but the attorney say they would like to discuss that at a future hearing.

Proceedings have started in a Boulder courtroom where Mohamed Soliman is expected to be read the charges against him.

Soliman is charged with several offenses, including first degree murder, assault and the possession of an incendiary device. State Judge Nance Salomone is presiding.

Stay tuned as we bring you the latest on the hearing.

We have just seen a version of the arrest warrant for the alleged attacker, Mohamed Sabry Soliman.

It confirms that Soliman is being held on charges of attempted first degree murder, first degree assault and possession of an incendiary device. Bail for the suspect is set at $10,000,000.

Medical personnel reported Soliman said the attack was vengeance for "his people," according to the warrant

All victims received burns caused by Mohamed's devices, the affidavit alleges.

The news briefing in Boulder has ended. A public information officer said no major updates are expected at this time.

The US attorney's office will send out a news release later today.

A question is asked about the immigration status of the suspect's family.

US Attorney Grewell says the family was cooperative after a search warrant was issued for Soliman.

He refers the question about their immigration status to the Department of Homeland Security.

The Boulder police chief was asked if there was any indication before the attack that Soliman was a threat and Redfearn says there was no prior knowledge of him.

FBI Agent Michalek also said he was not known to federal law enforcement.

Image source, City of Boulder

On victims, Redfearn says four more people who were injured came forward today. They were not previously known to police.

That was partly because their injuries were minor in nature, he said.

US Attorney Grewell is asked whether the hate crime charge is a terrorism charge, given there were mentions of terrorism on Sunday.

He says they charged Soliman quickly to "send a message to the community" that acts of anti-semitism will not be tolerated.

Just because there's only one charge made so far doesn't mean they're not considering other charges, Grewell tells the news conference.

Boulder Police Chief Stephen Redfearn says businesses can open if they choose to, adding that he was "heartened" by the resilience of the community this morning.

Speaking to business owners and community , Redfearn says he left thinking that "we're going to be OK".

Redfearn adds that the police want people to feel comfortable in the community.

As we reported earlier the FBI says it is not tracking any credible threats in the community

Boulder Police Chief Stephen Redfearn says the police department's strong relationship with the Jewish community has paid off and they are going to continue to working together.

"Bottom line is we want everyonoe to feel safe," he says.

FBI Agent Michalek said investigators are still looking for additional video footage, photos or information. He urged the public to come forward with any information they have information.

The FBI is not "tracking any credible threats" at this time in the Boulder area, he said.

Image source, City of Boulder

FBI Denver Special Agent in Charge Mark Michalek says they are still investigating but it appears Soliman allegedly acted alone.

District Attorney Dougherty says the Boulder community "has faced too many tragedies," mentioning fires, floods and mass attacks.

He says each time the community responds with "strength, resilience and " for each other.

"I trust and hope that will happen again," the DA says.