The United Kingdom on Monday blamed an Iran-linked proxy group for a string of antisemitic arson attacks targeting British Jewish sites, prompting the government to ban Tehran's powerful Islamic Revolutionary Guard Corps and impose sweeping new powers to crack down on foreign-backed sabotage.

British officials said the Islamic Movement of the Companions of the Right (IMCR) publicly claimed responsibility for seven attacks this year targeting Jewish and Israeli-linked locations, as well as a Persian-language media outlet critical of Iran's government. According to the U.K. government, members of the IRGC's elite Qods Force were "almost certainly" directing the group's operations across Europe.

The attacks included fires at synagogues, Jewish charity ambulances and other Jewish community sites in London. No injuries were reported.

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Prime Minister Keir Starmer said the new measures send a clear message to foreign adversaries seeking to sow violence.

"We will never let Britain be a playground for states who want to spread fear, division and violence on our streets," Starmer said. "Anyone acting on behalf of those who threaten our national security should be in no doubt that there is no place for you in Britain."

If Parliament approves the designations later this week, anyone carrying out acts of sabotage — including arson — on behalf of the IRGC, IMCR or Russia's GRU Volunteer Corps could face life imprisonment. Supporting or assisting the groups could carry prison sentences of up to 14 years.

The British government said the new authorities, created under the National Security (State Threats) Act 2026, will make it easier for prosecutors to secure convictions because they will no longer have to prove a direct foreign government connection in every case.

Home Secretary Shabana Mahmood accused both Tehran and Moscow of relying on criminal proxies to conduct hostile operations inside the United Kingdom.

"Iran and Russia are using proxies and thugs to do their dirty work on our shores," Mahmood said. "I have rapidly designated three groups so those working for them will be tracked down and put behind bars."

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The government said IMCR emerged online earlier this year and has also claimed responsibility for attacks on synagogues in Belgium and the Netherlands. British intelligence officials say Iran-backed proxy groups have increasingly recruited members of criminal organizations to carry out sabotage, intimidation and physical attacks across Europe, often targeting Jewish communities and Iranian dissidents.

According to the U.K., MI5 identified at least 20 potentially lethal Iran-backed plots against individuals in Britain over the past year. The government has already sanctioned more than 550 Iranian-linked individuals and entities and has pledged £250 million ($334,662,500) over three years to strengthen security for Jewish communities, including increased protection for synagogues, schools and community centers.

Britain also designated Russia's GRU Volunteer Corps, saying the group acts as a proxy for Russian military intelligence by recruiting individuals online to conduct sabotage, arson and other hostile operations.

The crackdown comes just weeks after two Romanian men were sentenced to prison for stabbing a journalist working for a Persian-language television station in London, an attack a British judge said was carried out on behalf of the Iranian state.

Iran did not immediately comment on Monday's announcement, according to The Associated Press.

The Associated Press contributed to this report.