More now from the Melania Trump's post - a rare public message from the former first lady.

She offers her sympathies to the families of the victims who are "suffering from this heinous act".

"Let us not forget that differing opinions, policy, and political games are inferior to love," she adds.

"Let us remember that when the times comes to look beyond the left and the right, beyond the red and the blue, we all come from families with passion to fight for a better life together."

She calls for unity, and urges people to "ascend above the hate, the vitriol and the simple-minded ideas that ignite violence".

Melania Trump has just reacted to the assassination attempt on her husband Donald Trump, saying the gunman was a "monster" who saw her husband as "an inhuman political machine".

In a statement posted on X, she says her and their son Barron's lives "were on the brink of devastating change" when she saw "that violent bullet strike my husband".

She says she is thinking of her "fellow Americans", and thanks people across the "political divide" for their support.

Image source, Reuters

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

I've just spoken to a shift manager at Bethel Park Skilled Nursing and Rehab, which is a nursing home, where we have been told Thomas Crooks worked in the kitchen.

I was initially asked to leave by a man in the parking lot and spoke to a shift manager shortly thereafter.

Citing privacy concerns and the ongoing investigation, she declined to comment on Crooks.

The nursing home is just a short drive away from the street where Crooks lived.

Access, however, remains tightly controlled with police vehicles blocking the roads. Only residents have been allowed in or out.

Image source, CBS

We can now bring you one of the first pictures of gunman Thomas Crooks.

CBS, the BBC's US partner, has just released a photo from the 20-year-old's high school yearbook.

As we reported earlier, Bethel Park High School has confirmed Crooks graduated in 2022.

Law enforcement officials believe the weapon used to shoot at Donald Trump was purchased by Thomas Crook's father, the Associated Press news agency reports.

Speaking on condition of anonymity, two officers told the AP that Crooks' father purchased a weapon at least six months ago.

Federal agents have not disclosed a motive for the attack, but authorities are treating the shooting as an "assassination attempt".

Laura Blasey
Reporting from Washington DC

On US Sunday morning news shows, lawmakers and political figures sought to make sense of last night's shooting. There was bipartisan condemnation of the violence.

"For me, this isn't about an opportunity for politics or strategy," Pennsylvania Senator John Fetterman, a Democrat, said in an interview on CNN.

"This was an incredibly dark day for Pennsylvania but for our nation, too."

On NBC's Today Show, House Speaker and Republican Representative Mike Johnson said: "Obviously we can't move on like this as a society."

Like Fetterman, he called for leaders of both parties to turn "the temperature down" in their rhetoric.

But he went on to criticise Democratic leaders and their supporters for their language surrounding Trump - claiming he had been "villified" and "persecuted" in the lead up to the attack.

Image source, Reuters

Our partners in the US, CBS, have received a statement from the school that gunman Thomas Crooks attended.

"Bethel Park School district can confirm that the alleged shooter in the July 13, 2024, assassination attempt on former President Donald J Trump is a graduate of Bethel Park High School," the statement says.

"Thomas Matthew Crooks graduated from Bethel Park High with the Class of 2022.

"The school district wishes to express its sincere wishes for a speedy and full recovery for Mr Trump and for those in attendance at the Saturday event who may have been physically harmed or emotionally impacted by these tragic events."

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

Image source, Getty Images

I'm now in Bethel Park, Pennsylvania, just blocks from the home of the suspect in yesterday's shooting.

It's still very much the scene of an active investigation into what took place. Trucks are blocking the roads near to his home, and police officers and guards in bright yellow vests are shooing away reporters, dozens of which seem to be combing the area.

Otherwise, it's quiet. Nearby businesses remain shut, and a Veterans of Foreign Wars (VFW) post two blocks away sits quietly.

The neighborhood is hilly and a lush green - in another scenario it strikes me as it would be an idyllic place to live.

One of the few businesses open nearby is a Dollar Tree, where staff members told me area residents are growing increasingly uncomfortable with the attention.

"So many people have been in here asking about the Butler guy," one lady told me in the lot. "You're already getting annoying."

How the investigation will unfoldpublished at 14:29 British Summer Time 14 July

14:29 BST 14 July

Frank Gardner
Security correspondent

There are essentially two strands to the urgent investigation already under way into this event - the first involves FBI and police detective work.

Having established the identity of the shooter, detectives need to investigate his motive, his recent movements, who he has been in contact with.

Importantly, they need to find out if he had accomplices, either physically or online. Was he acting for any kind of group or organisation, especially one overseas?

They will be going through any tech they can seize at his address, sifting through his digital history to see what websites he was on, what chat groups he belonged to, who he was in touch with.

Then there is the awkward question of how was this massive lapse of security allowed to happen.

The buck stops with the 7000-strong Secret Service whose primary job is to protect US presidents, both serving and former.

Guns are easy to come by in America - there are roughly three for every member of the population - but how was it the shooter was able to bear-crawl along a rooftop, armed with a rifle, to get to within 130m of Donald Trump?

Why were warnings from the public ignored or not acted on? And why, people will ask, when a highly charged presidential election is just four months away, did the Secret Service not do a better job of protecting the man many believe will be America’s next president?

The two victims injured at Donald Trump's rally remain in critical condition, BBC's news partner CBS has just reported.

The victims, whose identities remain unknown, were taken to Allegheny General Hospital after Saturday's shooting.

As a reminder, another spectator died in the attack, and the shooter himself was killed by the Secret Service.

Let's bring you another witness account from last night's rally.

Ben Macer told KDKA-TV he saw the gunman "move from roof to roof. [I] told an officer [the shooter] was on the roof".

"When I turned around to go back to where I was, it was when the gunshots started, and then it was just chaos, and we all came running away, and that was that."

He's not the only witness we've heard from today.

• One woman told the BBC she heard "pop, pop, pop" sounds before people started running at her. She said the scene was chaotic
• Warren and Debbie were to the right of the former president when they heard shots. Debbie said there was a little girl beside them crying, saying she didn't want to die

• Another witness told our reporter Gary O'Donoghue that he saw a gunman on the roof before the shooting - watch that video below:

In the past half hour, Donald Trump Jr has posted on X that Democrats and "their friends in the media knew exactly what they were doing" by implying Trump was "literally Hitler".

As we reported earlier, former Democratic congresswoman Tulsi Gabbard, and potential Trump running mate JD Vance, are among those who have questioned the rhetoric around the former president.

In addition to the gunman, who was shot and killed by Secret Service, there were three other casualties involved in last night's attack.

One adult male was killed while standing in the audience, Michael T Slupe, the Butler County sheriff, said.

Two other people, also confirmed by authorities as men, were critically injured. Details about their injuries have not been released.

A GoFundMe page, organised by the Trump campaign's national finance director Meredith O'Rourke, was set up in the hours after the attack with donations going to the families of the injured.

It has so far raised more than $340,000 (£267,000).

Image source, Reuters

Bernd Debusmann Jr
Reporting from Pennsylvania

Image source, Reuters

Good morning from Pennsylvania, which is still reeling from yesterday's shooting at the Trump rally in Butler.

I'm currently in the town of Cranberry, a town over from Butler. The sense of disbelief here is palpable, and it's plainly evident that something significant has happened.

The hotel where I stayed last night - an unremarkable, nondescript roadside in a strip mall - is abuzz with activity. The world's media have descended on the area, and on my way out I ran into European and Japanese news crews that have rushed here from bureaus in DC and New York.

Many locals seem to still be processing what took place.

"I can't believe this is happening," a young woman told me at a petrol station a few moments ago. "This doesn't feel real."

I'm now going to head to Bethel Park, where gunman Thoms Crooks lived.

Some more comments now from the Secret Service, who have released a new statement.

Anthony Guglielmi, a spokesman for the agency, says there is an "untrue assertion" circulating that a member on Donald Trump's security team had requested extra security "resources" and that request was "rebuffed".

"This is absolutely false. In fact, we added protective resources & technology & capabilities as part of the increased campaign travel tempo," Guglielmi says.

Donald Trump has thanked his supporters for their "thoughts and prayers" in his second public comments since the attempt on his life yesterday.

"It was God alone who prevented the unthinkable from happening. We will FEAR NOT, but instead remain resilient in our Faith and Defiant in the face of Wickedness," the former president wrote in a post on Truth Social.

"We pray for the recovery of those who were wounded, and hold in our hearts the memory of the citizen who was so horribly killed," he said, adding that it was more important now than ever "that we stand United".

"I truly love our Country, and love you all, and look forward to speaking to our Great Nation this week from Wisconsin."

We've just received this picture from the New York Times, which appears to show a bullet pass Donald Trump's head at last night's rally.

Image source, Doug Mills/The New York Times/Redux/eyevine

Image source, TMZ

• The FBI named 20-year-old Thomas Matthew Crooks as "the subject involved"
• He was shot dead by the Secret Service
• Crooks was from Bethel Park in Pennsylvania, around an hour from where the rally took place
• He was a registered Republican, according to state voter records
• But according to Reuters, when he was 17, he made a $15 donation to ActBlue, a political action committee that raises money for left-leaning and Democratic politicians
• He graduated in 2022 from Bethel Park High School, according to the Pittsburgh Tribune-Review. He received a $500 "star award" from the National Math and Science Initiative, the paper adds

• His father, Matthew Crooks, 53, told CNN he was trying to figure out what happened and would wait until he spoke to law enforcement before speaking

• Law enforcement officials said on Saturday Crooks carried no identification to the site of the shooting and had to be identified using other methods
• A motive has not been identified, but authorities are treating the shooting as an "assassination attempt"

British journalist Tom Newton Dunn - who was at Saturday's rally - has just spoken to our colleagues on the BBC News Channel.

He describes supporters "in carnival mode" before the event started, adding that Trump was over an hour late but that they "didn't mind that at all".

Trump was "just getting into the meat on illegal immigration" when the shots were fired, he says.

Newton Dunn says a lot of people weren't aware what was happening - it was only as shouts to get down rang out that it started to sink in.

"Some people burst into tears [...] one lady next to me was crouching on the ground saying 'Oh Jesus, oh Jesus, oh Jesus, they got him'...

"Others reacted in anger [...] some blaming people for it, blaming the Democrats for it, blaming Biden, blaming CNN [...] and they were angry at the Secret Service."

Newton Dunn adds there was a digital billboard outside the event - within an hour of the shooting, it said: "Democrats attempted assassination, President Trump" and "Praying for President Trump".

• As a reminder you can watch the full interview on iPlayer or follow along live by clicking Play above.

Image source, Tom Newton Dunn

Here's another look at footage we brought you earlier, showing the gunman crawling on the roof of a building near Donald Trump's rally in Butler, Pennsylvania.

• Warning: the video contains distressing content