A handwritten note recovered after a deadly shooting in Dallas detailed the suspect’s desire to inflict “real terror” on US immigration agents, the head of the FBI has said.

One person was killed and two people were critically injured after a gunman opened fire at an Immigration and Customs Enforcement (ICE) field office in Dallas, Texas, on Wednesday.

All three victims were in a transport van outside the facility at the time, the Department of Homeland Security said in a statement.

Several more people were injured before the gunman took his own life, officials said.

FBI director, Kash Patel, said the agency had seized devices and processed “writings” obtained at the scene and in the suspect’s home since the attack.

A handwritten note recovered read: “Hopefully this will give ICE agents real terror, to think, ‘is there a sniper with AP rounds on that roof?”

The FBI previously said the suspect left a bullet casing engraved with the phrase “ANTI-ICE” at the scene.

Mr Kash said in a post on X: “While the investigation is ongoing, an initial review of the evidence shows an ideological motive behind this attack.”

Acting ICE Director Todd Lyons told Sky News partner NBC that ICE agents pulled some of the detainees out of the line of fire.

“The shooter was just shooting at random vehicles inside,” Mr Lyons said

“They were still hit inside the vehicle. You know, there were some brave men and women on the ground that went into those vans, pulling those detainees out while they were under fire.”

According to the FBI, evidence recovered so far shows a high level of planning ahead of the shooting, including searches of buildings belonging to the Dallas County Office of Homeland Security and Emergency Management.

Officials have not yet disclosed the identity of the victims.

US Homeland Security Secretary Kristi Noem identified the gunman, in a Fox News interview, as Joshua Jahn, 29.

Ms Noem said he had fired the bullets from a nearby rooftop.

Read more from Sky News:
Star criticses show delay after Charlie Kirk killing
Meet NASA crew trying to complete feat not achieved for 50 years

Mr Jahn’s older brother, Noah Jahn, who lives around 30 miles north of Dallas in McKinney, said he was not aware his brother held any negative feelings towards ICE.

He said: “I didn’t know he had any political intent at all.”

The shooting comes at a time of heightened tension in the US following the assassination of right-wing influencer Charlie Kirk.

Mr Kirk, a close ally of President Donald Trump, was shot dead by a sniper while speaking at an event in Utah on 10 September.

Tyler Robinson, 22, has been charged with the murder of Mr Kirk.

Jessica Chastain has criticised Apple’s decision to delay the release of political thriller series The Savant after the killing of Charlie Kirk.

The actress, who is also executive producer of the show for the tech giant’s TV+ streaming service, said she was “not aligned on the decision to pause the release”.

In a post on Instagram, she said the programme, in which she plays a woman who tries to draw out potential terrorists online, is “so relevant” and she has never “shied away from difficult subjects”.

Chastain portrays a military veteran who works at the Anti-Hate Alliance, where she secretly visits 4Chan-like message boards and poses as a white nationalist to identify possible terrorists.

“‘The Savant’ is about the heroes who work every day to stop violence before it happens, and honouring their courage feels more urgent than ever,” Chastain said.

“I remain hopeful the show will reach audiences soon. Until then, I’m wishing safety and strength for everyone.”

She listed several acts of political violence in the US in recent years, including a plot to kidnap Michigan’s governor Gretchen Whitmer, the attempted assassinations of Donald Trump last year and also the killing of controversial influencer Kirk.

Read more:
The string of bloody political violence in the MAGA era

Apple said it chose to postpone the show after “careful consideration” but did not give a reason why.

Kimmel’s comeback show brings in record ratings

Meanwhile, millions of people tuned in to watch Jimmy Kimmel on Tuesday after he returned to TV after Disney suspended him for nearly a week after he made comments about Kirk.

ABC said 6.26 million people watched Kimmel as he said it was “never my intention to make light of” Kirk’s death. It was the late-night show’s highest-rated regularly scheduled episode.

Read more:
Explained: Why Jimmy Kimmel was taken off air

“I don’t think there’s anything funny about it,” he said as he choked up.

“Nor was it my intention to blame any specific group for the actions of what was obviously a deeply disturbed individual. That was really the opposite of the point I was trying to make”.

Kimmel had been accused of being “offensive and insensitive” after using his programme, Jimmy Kimmel Live, to accuse Donald Trump and his allies of capitalising on the killing.

Ammunition recovered from the scene of a shooting at an Immigration and Customs Enforcement (ICE) field office in Dallas was engraved with the phrase ‘ANTI ICE’, the FBI has said.

It is being investigated as an act of “targeted violence”, the bureau added.

There are conflicting reports about injuries. The Department of Homeland Security said two detainees had been killed and another was in a critical condition.

Earlier, Dallas police said one person had died and four had been shot.

The attacker also died from a self-inflicted gunshot wound. The suspect has not been identified.

The shooter opened fire on the office from an adjacent building at about 6.40am local time, officers said.

Dallas FBI Special Agent Joseph Rothrock said it was a “coordinated attack” and “just the most recent example we’ve seen of targeted violence”.

Early evidence suggested the incident was “anti-ICE in nature”, he added.

A recovered, unspent shell casing was engraved with the phrase “ANTI ICE”, said FBI director Kash Patel.

Multiple rounds were fired just before 7am local time, Mr Patel said.

An initial review of evidence shows an “ideological motive behind this attack”, he added, describing the assault as “despicable”.

The “whole of government” will respond, Mr Rothrock said.

“There will be no resource not utilised to bring all those individuals who are responsible to justice and to hold them accountable.”

No police officers had been hurt, Mr Rothrock added.

The victims were being led into the building to be processed and repatriated, Fox News reported, citing Dallas police Department sources.

Greg Abbott, the governor of Texas, said the shooting would “NOT slow our arrest, detention, and deportation of illegal immigrants”.

He added: “We will work with ICE and the Dallas Police Department to get to the bottom of the assassin’s motive.”

US Vice President JD Vance said: “The obsessive attack on law enforcement, particularly ICE, must stop.

“I’m praying for everyone hurt in this attack and for their families.”

No ICE agents were shot or hurt, Sky News’s US partner network NBC reported.

Despite the reports that no ICE agents were shot, US Attorney General Ken Paxton said: “We will continue to do everything in our power to combat the alarming increase of targeted attacks against ICE and all law enforcement by evil, twisted individuals.”