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Here's what we learned today.

Stay tuned to the BBC as we bring you the latest updates on the investigation into Halyna Hutchins' death.

Today's live coverage was brought to you by Jessica Murphy, Marianna Brady, Sam Cabral, Kelly-Leigh Cooper and Michelle Mullen.

Officials in Santa Fe say lab testing will be carried out to determine the types of ammunition found on the Rust film set.

Blanks can be used in the film industry to imitate live ammunition. The reason they are so convincing is that blanks are essentially modified real bullets.

While the term "bullet" is commonly used to describe what is loaded into weapons, more properly it is a cartridge that is loaded: a self-contained ammunition package made up of a casing holding an explosive powder that when fired, blasts out a projectile, or bullet.

Blanks differ because although they use explosive they don't use a projectile.

Much of the investigation into the shooting is still to be completed, but today's news conference gave us some interesting new details of the incident:

• The "lead projectile" recovered from the director's shoulder was "the live round that was fired from the revolver by Mr Baldwin", the sheriff said.
• Three individuals handled the weapon and have been cooperating with police. Baldwin shot the gun, but Rust's assistant director David Halls and armorer Hannah Gutierrez-Reed also handled the firearm.
• According to the county sheriff, the shooting took place with about 90 to 100 people on set.
• About 600 items of evidence have been collected, including three firearms and 500 rounds of ammunition.
• Police identified the firearm shot by Baldwin as an antique-edition F LLI Pietta Long Colt .45 revolver. They have also recovered the spent shell casing.
• All three firearms still need to be analysed in a crime lab. Police believe that, while they contain blanks and dummy rounds, there may be more live rounds in the mix from the set.
• It's still too early to say whether there will be any charges filed related to the incident.

Image source, Getty Images

Officials made clear today that the investigation is still in its early stages.

During the news conference, Santa Fe county sheriff Mendoza said evidence testing was still underway and there are many interviews to be done.

He noted some elements seem clear at this point.

"I think the facts are clear - a weapon was handed to Mr Baldwin. The weapon is functional and fired a live round killing Ms Hutchins and injuring Mr Souza," he said.

But there are still questions about the suspected presence of other live ammunition on set.

"Right now we’re gonna determine how those got there, why they were there - because they shouldn't have been there."

Lawyers for the producers of Rust will be conducting an investigation into the shooting on set.

The law firm Jenner & Block has just confirmed to BBC News that it will represent the producers.

The legal team will be led by Brandon Fox, a former federal prosecutor.

Fox previously had a two-year stint as criminal division chief with the Los Angeles US attorney's office.

Local officials have ended their news conference in Santa Fe.

Sheriff Mendoza says more questions will be answered as the investigation continues.

Image source, Getty Images

Every film set, big or small, has a prop master or armory expert to handle guns and other weapons.

They secure the weapons when they are not being used and instruct actors on their proper and safe use.

They also load the firearms and check them before and after each scene.

But there is no definitive set of regulations on the use of firearms across the film industry.

Incidents like the one on the set of Rust are incredibly rare, but calls have grown for a ban on live firearms on film sets.

Read more on the guidelines that currently exist.

Santa Fe district attorney Mary Carmack-Altwies says much of the investigation remains to be conducted.

"If the facts and evidence and law support charges, then I will initiate prosecution at that time," she said.

Nobody has yet been arrested or charged over the incident.

"All options are on the table at this point," says Carmack-Altwies.

"I do not make rash decisions and I do not rush to judgment," she adds.

Image source, Getty Images

The county sheriff states that other live rounds of ammunition may have been on the Rust set.

The bullets are yet to be tested in a crime lab, according to Sheriff Mendoza.

Of the recovered 500 rounds of ammunition, there was "a mix of blanks, dummy rounds and what we are suspecting is live rounds."

Sheriff Mendoza says police have recovered some 600 items of evidence - including three firearms and about 500 rounds of ammunition from the scene.

He says investigators believe they have the firearm which was fired by Alec Baldwin, as well as a spent shell casing from the shooting.

He adds that a "lead projectile" was recovered from the shoulder of Rust's injured director - Joel Souza - and handed over as evidence.

"We regard this specific spent casing and recovered projectile to be the live round that was fired from the revolver by Mr Baldwin," Sheriff Mendoza adds.

Image source, Getty Images

Investigators in Santa Fe are now detailing the incident that took place last week.

County Sheriff Adam Mendoza said two crew members - the film's assistant director and armorer - handled the firearm before actor and producer Alec Baldwin fired a fatal shot.

"All three individuals have been cooperative in the investigation and have provided statements," said Mendoza.

Police are beginning the first press conference on the Rust film set shooting that left one dead.

We will bring you the latest updates from officials in Santa Fe, New Mexico.

It’s only a few minutes until we hear an update from Santa Fe officials about the shooting death of Halyna Hutchins.

We expect County Sheriff Adan Mendoza, external to appear along with Mary Carmack-Altwies, external, Santa Fe’s district attorney.

The news conference will begin 10:00 local time (12:00 EST; 17:00 BST).

Image source, Getty Images

Investigators have said the man who handed Alec Baldwin his weapon was assistant director Dave Halls.

Halls reportedly called out "cold gun" as he did so, meaning the weapon had no live ammunition.

An affidavit filed over the incident claims he did not know there were live rounds in the firearm.

Press agency AFP reported on Monday that Halls had been dismissed from a previous film production in 2019 over gun safety violations.

The producers of Freedom's Path confirmed a crew member had "incurred a minor and temporary injury when a gun was unexpectedly discharged" on set.

Read more.

Image source, Reuters

Alec Baldwin fired the gun in Thursday's fatal shooting.

The US actor - known for acting credits like Saturday Night Live and The Departed - had been starring in and producing the film Rust when the accident happened.

On Friday he paid tribute to the 42-year-old cinematographer he accidentally killed.

“There are no words to convey my shock and sadness regarding the tragic accident that took the life of Halyna Hutchins, a wife, mother and deeply admired colleague of ours,” Baldwin said in a tweeted statement, external.

“I’m fully cooperating with the police investigation to address how this tragedy occurred and I am in touch with her husband, offering my support to him and his family. My heart is broken for her husband, their son, and all who knew and loved Halyna.”

He was later photographed meeting with the family of Hutchins at a hotel in Santa Fe.

Audio recordings have shown how first responders reacted after Halyna Hutchins was shot on set.

One is heard on a dispatch radio, saying a crew member was "shot accidentally".

Hutchins was airlifted to hospital but succumbed to her injuries.

Filmmakers from around the world have reacted to the fatal incident with statements of shock and sadness.

Image source, Reuters

News broke late last Thursday that actor Alec Baldwin had been involved in an accidental shooting death on a US movie set.

Details have gradually emerged in the days since as investigators try to piece together what happened.

We now know that:

• The shooting happened during a rehearsal on the set of Rust - a western movie Baldwin was producing and filming in Santa Fe, New Mexico
• Halyna Hutchins, the movie’s cinematographer, was killed in the shooting and the director of the film, Joel Souza, was wounded
• Legal documents say Baldwin had believed the gun was safe before it was handed to him. They also say the revolver discharged as he was practicing drawing it across his body and pointing it at a camera
• The weapon was being used as a prop but officials have described it as a “legit gun” that was “antique-era appropriate” for the production
• On Friday, Baldwin said there were “no words” to convey his “shock and sadness regarding the tragic accident” in a statement which paid tribute to Ms Hutchins as a “deeply admired colleague”
• Investigators have been carrying out searches of the set and interviewing witnesses in the case they describe as “complicated”
• They have refused to rule out filing criminal charges in the case, amid widespread media speculation about safety and gun regulation on set - including by former crew members

Image source, Getty Images

Women cinematographers are few and far between in Hollywood, and the industry has been mourning the loss of one of its rising female stars.

Born in Ukraine and raised on a Soviet military base in the Arctic Circle, Halyna Hutchins worked as a journalist in her home country, then a documentary maker in the UK.

She worked her way up through Tinseltown before she was chosen as director of photography on “Rust”, a Western starring Alec Baldwin.

Colleagues and peers have paid tribute to her as “an incredible artist” and “a wonderful mother”.

"She was so talented, a photography director with her own vision, her own strong ideas," said Alex Fedosov, another Ukrainian filmmaker, to the BBC.

Read more about Hutchins.

Law enforcement officials are expected to discuss their initial findings at Wednesday’s news conference.

It will be the first detailed public comments by investigators since Halyna Hutchins was accidentally shot dead last week.

Santa Fe County Sheriff Adan Mendoza, external and Santa Fe District Attorney Mary Carmack-Altwies, external are both set to appear.

The update comes a day after the district attorney told the New York Times that criminal charges could be filed in the case.

“We haven’t ruled out anything,” Ms Carmack-Altwies told the newspaper, external in an interview. “Everything at this point, including criminal charges, is on the table”.

We will be bringing you the latest from a news conference in Santa Fe, New Mexico, where officials are expected to give an update on the investigation into the death of cinematographer Halyna Hutchins on a movie set last week.

The news conference will begin at 10:00 local time (17:00 BST).