LONDON: On Nov. 16, 2022, armed police descended in force on a West London business park, home to leading international brands such as Starbucks and Danone and a sprinkling of media companies, among them CBS, Paramount and the Discovery channel.

To the shock of the thousands of people who work in the dozen modern buildings, clustered around landscaped gardens featuring lakes, a waterfall, cafes and a boardwalk, security barriers were thrown up at every vehicle entrance, pedestrians entering the site were obliged to pass through body scanners and the colorful food trucks on the campus were joined by a fleet of black police armored cars.

One building in particular, home to Persian-language satellite TV channel Iran International, came in for special attention. Security fencing and concrete 鈥淗ostile Vehicle Mitigation鈥� blocks were installed around it and armed police and dog handlers patrolled the perimeter.

Earlier that month, Volant Media, which owns the channel, had revealed that two of its British Iranian journalists had been warned by police that there was 鈥渁n imminent, credible and significant risk to their lives and those of their families.鈥�

Its journalists were accustomed to receiving abuse on social media, a spokesman said, but the threats marked 鈥渁 significant and dangerous escalation of a state-sponsored campaign to intimidate Iranian journalists working abroad.鈥�

Two months earlier, Esmail Khatib, Iran鈥檚 intelligence minister, had said Iran International had been categorized by Tehran as a 鈥渢errorist鈥� organization and that its 鈥渁gents鈥� would be pursued.

Sanctions were also announced against the channel and BBC News Persian, both accused of inciting riots and supporting terrorism with their coverage of protests in Iran, triggered by the death in custody of 22-year-old Mahsa Amini, who had been arrested in Tehran for violating Iran鈥檚 hijab laws.

On the same day that armed police locked down Chiswick Business Park, Ken McCallum, director-general of the UK鈥檚 domestic security service, MI5, said Iran 鈥減rojects threat to the UK directly, through its aggressive intelligence services.

鈥淎t its sharpest this includes ambitions to kidnap or even kill British or UK-based individuals perceived as enemies of the regime.鈥�

Only the previous week, he added, the British foreign secretary had 鈥渕ade clear to the Iranian regime that the UK will not tolerate intimidation or threats to life towards journalists, or any individual, living in the UK.鈥�

But the news that one of Iran International鈥檚 London-based journalists had been attacked by a group of men and stabbed outside his home in Wimbledon, in south London, on March 29 showed that the regime remains undaunted in its determination to intimidate dissidents wherever they are in the world.

Pouria Zeraati survived the attack, which left him wounded in the leg 鈥� he later released a photograph of himself in hospital, smiling defiantly and vowing to be back on air soon. Back on the airwaves, he said 鈥渢he show must go on.鈥�

The attack is being investigated by the Metropolitan Police鈥檚 Counter Terrorism Command, which says his attackers drove straight to Heathrow Airport and fled the country. Their destination has not been revealed.

The 鈥渟iege鈥� of Chiswick Business Park, as it became known locally, continued until February 2023, when Iran International announced it was 鈥渞eluctantly and temporarily鈥� closing its London studios and moving to Washington, D.C.

The last straw for the company was the arrest on Feb. 11, 2023, of an Austrian national, who was caught red-handed by security staff while carrying out 鈥渉ostile reconnaissance鈥� outside its offices.

Magomed-Husejn Dovtaev was swiftly arrested by armed anti-terrorist police in a cafe at the business park.

He was charged with terrorism offenses and at his trial at the Old Bailey in December 2023 was found guilty of attempting to collect information 鈥渓ikely to be useful to a person committing or preparing an act of terrorism."

During the trial it was revealed that the Chechen individual had taken a minicab directly to the business park after flying to Gatwick Airport from Vienna. He was sentenced to three years and six months in prison.

The reality, said an Iranian activist living in London speaking on condition of anonymity, 鈥渋s that Iranian dissidents living in exile know they are increasingly at risk from a regime that has shown it can and will reach out to intimidate, threaten and even kill anyone, anywhere, any time.

鈥淚t is also clear that it has no qualms about using foreign and domestic criminals as its weapons of choice.鈥�

The depths to which Iranian operatives are prepared to sink in order to silence critics became clear in January this year, when the US and the UK jointly imposed sanctions on a network of 鈥渋ndividuals that targeted Iranian dissidents and opposition activists for assassination ... .鈥�

According to the US Treasury, the network was led by 鈥淚ranian narcotics trafficker Naji Ibrahim Sharifi Zindashti and operates at the behest of Iran鈥檚 Ministry of Intelligence and Security.鈥�

Zindashti鈥檚 gang was responsible for 鈥渘umerous acts of transnational repression including assassinations and kidnappings across multiple jurisdictions in an attempt to silence the Iranian regime鈥檚 perceived critics.鈥�

In a statement, the US Department of the Treasury鈥檚 Office of Foreign Assets Control said that the MOIS and Iran鈥檚 Islamic Revolutionary Guard Corps (IRGC) 鈥渉ave long targeted perceived regime opponents in acts of transnational repression outside of Iran, a practice that the regime has accelerated in recent years.

鈥淎 wide range of dissidents, journalists, activists and former Iranian officials have been targeted for assassination, kidnapping and hacking operations across numerous countries in the Middle East, Europe and North America.鈥�

The scale of the IRGC鈥檚 black-ops program in one country alone was hinted at in February last year when Assistant Commissioner Matt Jukes, the head of the Metropolitan Police鈥檚 counterterrorism unit, said that police and MI5 had foiled 鈥�15 plots since the start of 2022 to either kidnap or even kill British or UK-based individuals perceived as enemies of the regime.鈥�

Only occasionally do such plots make the headlines.

The US believes that IRGC agents engineered the assassination in The Netherlands of Ahmad Molla Nissi, a 52-year-old activist who campaigned for independence for Iran鈥檚 Ahwazi Arabs. Nissi was shot dead outside his home in The Hague in November 2017.

In October 2019 Ruhollah Zam, a journalist living under political asylum in France who ran a popular anti-government website, was kidnapped during a visit to Iraq. After being taken to Iran, he was tortured, subjected to a sham trial and then hanged on Dec. 12, 2020.

In July 2020 Jamshid Sharmahd, an Iranian German activist, was kidnapped while traveling abroad and forcibly brought to Iran, where he has been sentenced to death.

According to US Treasury, Tehran 鈥渋ncreasingly relies on organized criminal groups in furtherance of these plots in an attempt to obscure links to the Government of Iran and maintain plausible deniability.鈥�

Zindashti, who was sanctioned by the US in January and is believed to be in Iran, is wanted by the FBI 鈥渇or his alleged involvement in criminal activities including the attempted murder-for-hire of two residents of the state of Maryland.鈥�

His, says the FBI, 鈥渁llegedly used encrypted, internet-based messaging applications to hire criminal elements within North America to murder two individuals who fled Iran鈥� and 鈥渁llegedly provided resources to facilitate the attempted transnational killing of a person within the United States.鈥�

On Dec. 13 2023, a federal arrest warrant was issued for Zindashti after he was charged with 鈥淐onspiracy to use interstate commerce facilities in the commission of murder-for-hire鈥� 鈥� US legal longhand for hiring a hitman.

According to the FBI, Zindashti was born in Urmia, a city in Iran鈥檚 northwest, close to the borders of Iraq and Turkiye. He weighs approximately 113 kg, is 190 cm tall and speaks several languages, including English, Farsi and Turkish.

The Iranians鈥� predilection for collaborating with underworld characters has led to some strange alliances. Alongside Zindashti, in January the US Justice Department indicted two Canadian nationals as alleged accomplices in his murder-for-hire plot to kill two US residents in Maryland.

Damion Patrick John Ryan, 43, and Adam Richard Pearson, 29, are members of a chapter of the motorcycle gang Hells Angels. Both are imprisoned in Canada on unrelated offenses.

The US Justice Department released , who communicated through Sky ECC, an encrypted messaging network that has since been shut down by authorities in the US and Europe.

A fee of $350,000, plus $20,000 in expenses, was agreed for the killing of two targets, a man and a woman. Photographs of the intended victims were exchanged, along with their address and a map showing their location.

Discussing the plot regularly between December 2020 and January 2021, Ryan told Zindashti that having someone killed in the US was challenging, but that he 鈥渕ight have someone to do it.鈥� That same day he messaged Pearson about a 鈥渏ob鈥� in Maryland.

Pearson replied to say he was 鈥渙n it鈥� and that 鈥渟hooting is probably easiest thing for them.鈥� He would tell the gunmen he planned to recruit to 鈥渟hoot (the victim) in the head a lot (to) make example,鈥� adding 鈥淲e gotta erase his head from his torso.鈥� A 鈥渇our-man team鈥� would carry out the killings.

Immediately after the attack on Zeraati in London, a former journalist with Iran International said she had been told by the Metropolitan Police Counter-Terrorism Unit 鈥渢o immediately leave my residence and stay elsewhere until further notice.鈥�

Writing on X, Sima Sabet revealed that last year she and her colleague Fardad Farahzad, who is now based in Washington, had been the targets of an assassination attempt orchestrated by the IRGC.

She said the plot was foiled by a 鈥淲estern security service,鈥� which had obtained 鈥渁udio and video files in which a Quds Force commander ordered an individual to kill me and Farahzad with a knife.鈥�

According to Sabet, the attack on Zeraati was 鈥渁 serious warning and an extremely troubling act for all journalists and opponents of the Islamic Republic in Britain and other Western countries.鈥�

Mehdi Hosseini Matin, Iran鈥檚 charge d鈥檃ffaires in the UK, has said 鈥渨e deny any link鈥� to the attack.