A new video showing the Charlie Kirk shooting suspect fleeing the scene is released by the FBI and Utah officials – watch it here
In the clip, a figure runs across a roof where the fatal shot was fired from and drops several feet to the ground, before running into a wooded area
Police also release new images of a "person of interest" wearing a black T-shirt with a US flag on it and Converse shoes – see them here
The manhunt for the gunman continues, with the FBI offering $100,000 for information
Authorities say they are gathering the evidence needed to pursue the death penalty for the suspect, a day after discovering a high-powered rifle nearby
Meanwhile, US Vice-President JD Vance accompanies Kirk's body as it is flown back to Phoenix, Arizona
We now have police audio from shortly after the shooting – while our Verify team has looked for clues in the pictures released by the FBI
Edited by Dulcie Lee and Sean Seddon, with Nada Tawfik, Regan Morris and Christal Hayes at Utah Valley University
It's just approaching midnight in Utah, where the search for Charlie Kirk's killer continues. If you're just joining our coverage, here are the latest developments.
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Watch: New video of moment Kirk shooting suspect flees the scene
Earlier today, BBC chief presenter Caitriona Perry spoke to David Engelhardt, Charlie Kirk's pastor and a board member of Kirk's organisation, Turning Point USA.
He says that Kirk was a great friend and courageous person who "stood against the orthodoxy of our time", stood "specifically against nonviolence" and encouraged an open dialogue on campuses.
"His premise was to begin conversations with people. And the reality is conversations are challenging and polarising," Engelhardt says.
Perry notes in the interview that some of Kirk's views were controversial and offensive, but that he always wanted to have that debate to justify his viewpoints and hear what others had to say. Engelhardt agrees.
"Finding a balance in a politically divided time where entertainment media feeds on controversy – and controversy is not a bad thing necessarily – but when it's inflamed to the point of violence, we have real problems," he says.
Engelhardt adds that it seems "imperative that political conversations continue", but also "that the love and the decision to respect the dignity of the human being remains essential in the conversation".
The FBI has released new footage showing the suspect in the killing of US activist Charlie Kirk running across a roof – from where the fatal shot was fired – before dropping to the ground and crossing a road.
As the authorities continue their search, BBC Verify’s Nick Beake has been looking at the footage and what we know so far.
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BBC Verify: New clues in hunt for Charlie Kirk’s killer
It's just past 23:00 in Utah – if you're just joining us now, here are the latest developments.
Stay with us as we bring you the latest.
People across the US have on Thursday evening been attending vigils in memory of Charlie Kirk.
At Orem City Center Park, Utah – a short drive from the university campus where Kirk was fatally shot – crowds gathered, lighting candles and waving flags as a way of paying their respects.
Others gathered outside the mortuary in Phoenix, Arizona where the body of Charlie Kirk has been delivered.
And in Florida, memorials were held on the campus of Florida Atlantic University in Boca Raton.
Former FBI agent Dennis Franks spoke to the BBC News Channel earlier, and said that he believed the shooter was likely a hunter.
“It required a lot of confidence to be able to take the shot, to execute and hit where it did,” he told the BBC, explaining that the distance of the shooting would not be challenging for an experienced shooter.
While "anyone could go down to a rifle range and train with a scope", the former FBI agent said it was a combination of the area and the "confidence" of the gunman that suggested to him that the person who shot Charlie Kirk could be a hunter.
“I tend to think from a behavioural standpoint that he acted alone,” he said.
He urged people to be patient, and reiterated that he was confident that the shooter would be identified, after which it would "be a matter of finding him".
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:
The suspect can be seen running across the roof of the building from which the fatal shot was fired
The suspect climbs down the side of the building
The suspect then flees the scene on foot
The suspect (wearing a black t-shirt) then crosses the street into a wooded area
Earlier we mentioned that authorities have released a new video of the suspect fleeing the scene.
Here's a look at what we saw:
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Watch: Officials release new video of Kirk shooting suspect fleeing the scene
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.
Here's a summary of the main developments:
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.
US Vice-President JD Vance and his wife Usha accompanied Charlie Kirk's widow Erika on Air Force Two
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:
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