Chris Piehota, a retired FBI executive assistant director, was speaking to the BBC's Newsday programme a while ago.

He said the FBI was likely still in the stage of gathering and analysing data from the shooting - including footage from personal devices, surveillance footage and audio clips.

He said he's "confident" that they would catch the shooter.

"I am confident that the FBI is one of the best man-hunting organisations in existence," Piehota said, adding that the FBI has "massive resources" to "aggregate and analyse" information - and similar processes were used during the Las Vegas shooting in 2017.

Shortly before FBI released a fresh video showing the escape of the suspected shooter, the last student who asked Charlie Kirk a question during the campus debate spoke out on social media.

In a video on Instagram, Hunter Kozak, a current student of Utah Valley University, says: "You sick... psychos that think this is the answer - it's not."

At the debate, Kozak was asking Kirk a question about gun violence moments before the gunshot rang out.

“I’m on the record with how much I disagree with Charlie Kirk but like, man dude, he is still a human being. Have we forgotten that?” Kozak says.

“People have obviously pointed to the irony that the point I was trying to make is how peaceful the left was right before he got shot - and that only makes sense if we stayed peaceful."

Authorities have just released a new video of the suspect fleeing the scene, which you can watch here.

Here are some stills from that video showing his movements inside the campus:

Image source, FBI

Image source, FBI

Image source, FBI

Image source, FBI

Earlier we mentioned that authorities have released a new video of the suspect fleeing the scene.

Here's a look at what we saw:

It was a short press conference in the end - lasting only about 10 minutes. Officials didn't take any questions from attending journalists and FBI Director Kash Patel did not speak at the press conference.

Image source, FBI

Here's a summary of the main developments:

• Officials have released a new video of the suspect, where he can be seen running across the roof of the building from which the fatal shot was fired and fleeing the scene
• The suspect was wearing sunglasses, Converse shoes and a "distinctive" black t-shirt with an American flag and eagle

• Utah Department of Public Safety Commissioner Beau Mason showed "enhanced" photographs of the suspect, and said public tips "are giving us our next leads"
• Law enforcement has received more than 7,000 tips so far, Utah Governor Spencer Cox said - the largest number the FBI has received since the Boston Marathon bombing in 2013
• Cox warned there is a "tremendous" amount of misinformation circulating online and urged people not to share it. He said Russian and Chinese bots were playing a role in its spread
• He added there is "a lot of forensic evidence" being processed, and that authorities are gathering the evidence needed to "pursue the death penalty"

Governor Cox says that there is "a lot of forensic evidence that is being processed right now" in both state and federal labs.

"More than anything, we are going to catch this person," he adds.

Authorities are gathering all the evidence needed to "pursue the death penalty in this case", he says. "That will happen here in the state of Utah."

He ends his speech - and the press conference - by thanking the public for their prayers.

"I know we are feeling those prayers, I know the Kirk family is feeling those prayers as well," he says. "We pray that God will bless our nation at this very dark time."

Governor Cox said there is a "tremendous" amount of misinformation circulating online and urged people not to share it further.

In reference to Kirk, Cox said: "I think Charlie said it best, that when things get bad we should put our phones down and spend time with our families."

"Our adversaries want violence,” Cox added, claiming that Russian and Chinese bots on social media are playing a role in spreading false information.

Utah Governor Spencer Cox continues by saying that they cannot do their job without the support of the public.

So far, more than 7,000 leads and tips have been submitted by the public - the largest number the FBI has received on an incident since the Boston Marathon bombing in 2013, says Cox.

He adds more than 200 interviews have so far been completed - and encourages the public to continue to send any photo or video information to the FBI.

Mason is now describing "enhanced" still photographs of the suspect, asking people to pay attention to his "distinctive" T-shirt, black backpack and cap with a triangle logo.

"We just ask for the public's cooperation. Through the public, the tips that have been coming in ... are giving us our next leads and enabling us to continue to further this investigation," he said.

The video opens with a frame of the building from which the shot that killed Kirk was fired.

A figure dressed in black is seen running across the roof to a corner of the building, where they climb over the edge and drop to the grass beneath, before walking to a nearby road and crossing it to enter a “wooded area”.

Authorities say the suspect was wearing sunglasses, Converse shoes and a “distinctive” black T-shirt with an American flag and an eagle.

Utah Governor Spencer Cox begins the press conference by saying that they will share a video of the suspect, as well as explaining still images that have already been released.

He adds that they are showing this information to "get help from the public" to find the "evil human being".

FBI Director Kash Patel and other officials are due to appear for a press conference shortly.

Stay with us as we bring you the latest - and you can view it by clicking the Watch Live button at the top of this page.

While we're waiting for the FBI press conference to begin shortly - which you can view by clicking the Watch Live button at the top of this page - we can show you photos of Charlie Kirk's casket being offloaded Air Force Two in Phoenix, Arizona.

As we reported a short while ago, Vice-President JD Vance was also onboard the roughly one-hour flight from Salt Lake City, Utah to Phoenix.

Image source, Reuters

Image source, Reuters

Image source, Reuters

Image source, Reuters

BBC's Nada Tawfik has been reporting from Utah Valley University, where Charlie Kirk was shot dead.

Here's her latest report from the campus. Have a watch:

FBI Director Kash Patel will hold a news conference at 19:30 local time in Utah (02:30 BST), in just over 30 minutes.

The press conference will also be attended by FBI Special Agent in Charge Robert Bohls, Utah Governor Spencer Cox and Utah Department of Public Safety Commissioner Beau Mason.

Stay with us as we bring you the key developments.

Utah Public Safety has just released more photos of the "person of interest" in connection with the murder of Charlie Kirk at Utah Valley University.

We can now show you these images:

Image source, Utah Public Safety

Image source, Utah Public Safety

Image source, Utah Public Safety

Image source, Utah Public Safety

Image source, Getty Images

Utah Public Safety Commissioner Beau Mason has spoken to the media about the suspect's movement before and aftr fatally shooting Kirk.

In an interview with NBC News, external Mason says it was easy for the suspected shooter to access the roof of a Utah Valley University building and open fire.

The building, Mason says, had open pathways and lacked locked doors.

Mason says the suspected shooter was tracked on security footage moving across campus to the roof.

The suspected shooter jumped from the roof down to a grassy area, out through a parking lot and fled into the woods after the shooting, he says.

Mason adds that the single shot that killed Kirk was fired from a distance of 175 yards - which is considered an "average shot" for a skilled rifleman, but that "it doesn’t necessarily require an expertise".

Mason previously said that the suspect blended in easily on the campus and appeared "to be of college age".

Earlier, BBC's US media partner CBS News reported that officials have said they know the name of the suspected shooter but have not yet released it.

Image source, EPA

White House Chief of Staff Susie Wiles says Kirk "was very much" part of the family, and so his death "shook everyone to their core".

In an interview on The Scott Jennings Radio Show, she called Wednesday a "roller-coaster", during which they thought good news would follow the bad, but it didn't so it was "very rough".

She said that for many of them, it brought back memories of the assassination attempt that Trump endured on 13 July, 2024 in Butler, Pennsylvania.

"And then today is 9/11, so it's sort of a one-two punch," she added.

Image source, NurPhoto via Getty Images

Charlie Kirk was fatally shot in front of hundreds of young people, many of whom recording on their phones at the time. Moments later, videos of his assassination could be seen on social media.

TikTok says it is working to avoid those videos circulating across users' feeds.

"We remain committed to proactively enforcing our community guidelines and have implemented additional safeguards to prevent people from unexpectedly viewing footage that violates our rules," TikTok's spokesperson Jamie Favazza says in a statement.

Republican Congresswoman Anna Paulina Luna says the video-sharing platform has told her "they will be removing the horrific videos of Charlie Kirk’s final moments".

We can now bring you some photos of Air Force Two - the vice-president's aircraft - departing Utah for Arizona, external carrying the body of Charlie Kirk.

As we reported earlier, US Vice-President JD Vance is also onboard the flight to Phoenix.

Tyler Bowyer, who was chief operating officer of Turning Point USA, which Kirk founded, posted a video of Kirk's casket arriving at the airport on social media.

"Thank you for bringing our hero home," he wrote, tagging Vance. "We are so grateful for you."

Image source, Reuters

Image source, Reuters