Little information has come out about the alleged suspect, 20-year-old Thomas Crooks.

The latest detail to emerge is that he was a member of a local gun club in Jefferson Hills, Pennsylvania, roughly 50 miles (80km) from where the assassination attempt occurred.

The Clairton Sportsmen's Club's president, Bill Sellitto, told CBS News, the BBC's US partner: "We can confirm that Mr Crooks was a member of the Clairton Sportsmen's Club.

"Beyond that, the club is unable to make any additional commentary in relation to this matter in light of pending law enforcement investigations."

Selitto said the club "fully admonishes the senseless act of violence" and offers its "sincerest condolences" to the victims.

A law enforcement source confirms to the BBC's US partner, CBS News, that bomb material was found in both the gunman's residence and vehicle.

The devices are being described by the FBI as "rudimentary".

The source told CBS that the materials are being analysed in an FBI laboratory at the agency's base in Quantico, Virginia.

The Secret Service has ended its press conference, keeping mostly tight-lipped about yesterday's assassination attempt.

Reporters also fired several questions about security concerns for the upcoming Republican National Convention in Wisconsin, where Trump will be for the next few days.

"Why should former President Trump, his family and the convention-goers have confidence in the US Secret Service," one reporter asks.

A spokesperson for the Secret Service said the event had been designated a "national special security event", an event which has "the highest level of security for any event that can be designated by the government".

There's no specific, articulated threat to the Republican Convention or any individual attending, according to Michael Hensle, the special agent in charge of the FBI's Milwaukee field office.

Hensle said there has been an uptick in social media with people talking about what happened on Saturday evening and ahead of the convention on Monday.

Social media being monitored closely and if it trends into criminal activity, it will be disseminated, he said.

Multiple reporters have asked about the presence of guns at the upcoming Republican National Convention.

The event is scheduled in Milwaukee, Wisconsin which is an open carry state - which means local law allows people to carry their firearms in public.

The Secret Service will ban guns within the federal spaces it controls within the convention, but a spokesperson said they cannot control "the soft perimeter outside of our federal jurisdiction".

Milwaukee Mayor Cavalier Johnson says that on a local level, the city "banned the items we could ban".

"Banning weapons within the outer perimeter, that is not within our purview," Johnson says.

Even before the attempted assassination on Donald Trump, there were concerns about the presence of guns in the vicinity of the Republican convention.

The Secret Service is making its first public remarks since the assassination attempt on Donald Trump and agents are addressing security plans for the Republican National Convention this week.

An agency spokesperson tells reporters that they are confident in their plans for the event in Milwaukee, emphasising that the attack on Trump has not prompted any changes.

"We are not anticipating any operational changes to our security plans for this event," the spokesperson said.

Additional details from the assassination attempt on Donald Trump are still coming in, along with other updates.

If you're just joining us today, here's what we've learned this afternoon:

• FBI Special Agent Kevin Rojek said there are currently no indications that the gunman suffered mental health issues and there is no clear motive. He said the suspects cell phone and the gun used in the attack is being sent to an FBI lab.
• Donald Trump wrote on Truth Social, his social media platform, that he will depart today for Wisconsin to attend the Republican National Convention which begins on Monday.
• President Joe Biden made brief remarks from the White House ahead of an address from the Oval Office later tonight. He said the investigation is still in its early stages and security would be increased ahead of the Republican National Convention.
• President Biden also said an independent investigation was underway and that he would make the findings public.
• Melania Trump made a rare public statement regarding the attack, calling the gunman a "monster" and asking Americans to "ascend above the hate".
• Additional details about the identified gunman, Thomas Crooks, have surfaced. He was a registered Republican voter who also donated money to a Democratic fundraiser.
• The victim who died was identified as Corey Comperatore, 50, a volunteer fire chief. Police named the two others who remain in hospital in critical condition as David Dutch, 57, and James Copenhaver, 74.
• A GoFundMe setup for victims has exceeded $2m (£1.5m)

Laura Blasey
Reporting from Washington DC

Republican Representative Steve Scalise appeared on CBS this morning with a unique perspective.

Scalise, a ranking Republican in the House, was among six people shot when a gunman opened fire at a baseball field in Virginia in 2017 as the Republican congressional baseball team practiced ahead of an annual charity game. The gunman, who was killed by police, was angry with the Republican party.

"It brought back a lot of memories, a lot of emotions," Scalise says of yesterday's shooting. "You hear the pops of the shots and that's a lot of what it sounded like on the ballfield in 2017."

Like other officials today, he called for all sides to tone down their rhetoric surrounding the election.

He recalls a "reset" moment after the 2017 shooting and hopes one will be possible again.

"I think moments like yesterday just kind of refocus everybody, reset everything. In the shooting in 2017, for a long period time, there did seem to be a dialing down and hopefully there will be a dialing down again."

"I think everybody's gotta look in the mirror."

Image source, Reuters

Earlier we heard tributes to the man shot dead during the attack at the rally, 50-year-old Corey Comperatore, a volunteer firefighter and father of two.

The governor of Pennsylvania Josh Shapiro praised Comperatore’s bravery in shielding his family from the bullets.

Pennsylvania state police have now named two other victims injured in the attack, 57-year-old David Dutch and 74-year-old James Copenhaver.

Both lived in the Pittsburgh area, and police said both were in stable condition.

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

At the beginning of the call with reporters earlier, we heard from Attorney General Merrick Garland and FBI Director Christopher Wray.

In his comments, Garland said the shooting was "an attack on our democracy itself".

"The Justice Department has no tolerance for it," he added. "And as Americans, we must have no tolerance for it. This must stop."

Wray, for his part, described the attack as "absolutely despicable" and said that "the American people can rest assured that we will leave no stone unturned as we work to get to the bottom of what happened yesterday".

Many questions, however, still remain - particularly about the culprit's motivations and the sequence of events that took place ahead of the shooting.

One of the largest outstanding questions is how the attacker was able to get close enough to former President Trump to carry out the shooting as attendees tried to warn authorities at the event.

BBC Verify has reviewed footage, eyewitness testimony and satellite images to reconstruct how the attack unfolded.

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

We've just wrapped up a briefing call with FBI officials involved in the investigation, who were able to provide some clarity despite the many questions still swirling.

In the call, the officials confirmed that the rifle used in the Butler shooting was purchased legally by Crooks' father.

At the moment, however, it is not clear whether Crooks was given the weapon, or whether he took it without his father's permission.

The family is cooperating with the investigation, according to FBI Special Agent Kevin Rojek.

The rifle has been sent to an FBI lab in Virginia for processing, along with Crooks' phone and a suspicious device found in his vehicle.

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

FBI Special Agent Kevin Rojek just said that, so far, there are no indications that Crooks was suffering from any mental health issues.

The FBI is currently focused on Crooks' motivations, particularly via his social media.

"We have not seen anything threatening," he added. "But it's still very early on."

The FBI is still "working to get access" to Crooks' phone. It is currently being sent to an FBI lab in Quantico, Virginia.

Recent communications have revealed nothing as to his motivations or a larger plan, according to the FBI officials on the call.

Bernd Debusmann Jr
Reporting from Bethel Park, Pennsylvania

The FBI and US Department of Justice - including Attorney General Merrick Garland and FBI Director Christopher Wray - are currently briefing reporters, although they are limited in what they can say amid the ongoing investigation.

FBI Special Agent Kevin Rojek said that it appears the "shooter acted alone" and that there are no ongoing security concerns.

"We have not identified an ideology associated with the subject," he said, warning that the investigation is still in its early stages.

Evidence response teams are still processing the crime scene in Butler, he said, adding that agents are still combing through the suspect's social media and online presence for clues.

The gun, he confirmed, was an AR-style rifle purchased legally. A suspicious device found in the suspect's car is still being examined.

Another FBI official said the incident is also being investigated as a potential act of domestic terrorism.

Summer Barkley, who went to school with Thomas Crooks, said he was always getting good grades on tests and excelled in government classes.

“He was very passionate about history,” she said.

Barkley added that from what she knew from friends, Crooks seemed to always know what he was talking about when it came to government or history.

“It was nothing out of the ordinary. He was a nice kid," she said.

Less than 24 hours after Donald Trump wrote on social media that "a bullet pierced the upper part of my ear", he will soon board a plane for Wisconsin for the Republican National Convention, he wrote on Truth Social, his social media platform.

"Based on yesterday’s terrible events, I was going to delay my trip to Wisconsin," he said.

But the former president said he "cannot allow a 'shooter,' or potential assassin, to force change to scheduling".

"Therefore, I will be leaving for Milwaukee, as scheduled" at 15:30 ET (20:30 BST).

He has long portrayed a tough-guy persona in his political career, including - most recently - when he pushed aside Secret Service agents to defiantly raise his fist after the shooting.

Biden concludes by saying he will speak further on the shooting this evening, this time broadcasting from the Oval Office.

That address is expected to take place at 20:00 ET.

He declined to take questions from reporters.

In his brief press conference, Biden gives three updates.

He says that Trump has been given a "heightened level of security" and would be provided with "every available resource" to ensure his protection.

Biden says security measures in Wisconsin, where the Republican Convention will be held starting Monday, will be elevated.

"I've directed the head of the Secret Service to review all security measures," he says.

Lastly, Biden says he has ordered an independent review to discern what happened at the Trump rally in Pennsylvania where a gunman fired past the former president, killed one and injured two others.

"We'll share the results of that independent review with the American people", he says, adding that "we must unite as one nation".

Rachel Looker

Biden says he and Vice President Kamala Harris were briefed in the situation room by the Homeland Security team and the FBI director.

The president says the FBI is leading the investigation, which is in its early stages.

He says there is still no information about the motive of the shooter.

"I urge everyone, please, don't make assumptions about his motives or his affiliations," Biden says. "Let the FBI do their job and their partner agencies do their job"

"I've instructed that this investigation be thorough and swift and the investigators will have every resource they need to get this done," he adds.

President Biden is expected to address the media shortly.

Last night, he responded within hours to the shooting, saying there is "no place in America for this. We must unite as one nation to condemn it. It's sick, it's sick".

Biden and Vice-President Kamala Harris were briefed on the latest updates to the situation this morning.

Image source, The White House