British Prime Minister Keir Starmer and US President Donald Trump (not pictured) hold a bilateral meeting at Trump Turnberry golf course in Turnberry, Scotland, Britain, July 28, 2025. Photo: REUTERS/Evelyn Hockstein

British Prime Minister Keir Starmer said on Thursday he was “increasingly concerned” about a growing use of proxies by foreign states to carry out attacks in Britain, pledging to bring forward new legislation following recent attacks.

London has seen a string of attacks – mostly arson – on Jewish-linked sites in recent weeks. Some of these are being investigated by counter-terrorism officers, although police say they are not currently being treated as terrorist incidents.

British authorities have increasingly pointed to hostile state activity as part of the backdrop to recent incidents, warning that foreign governments may seek to operate through criminal networks or proxies to maintain deniability.

“I’m increasingly concerned that a number of countries are using proxies for attacks in this country,” he said, speaking after meeting members of the Jewish community at Kenton United Synagogue, which was the target of an arson attack last Sunday.

The fire caused minor smoke damage to an internal room and there were no injuries. A 17-year-old British boy pleaded guilty on Tuesday to arson not endangering life in connection with the incident.

“We have to deal with malign state actors,” Starmer said, adding that it would require legislation by the government.

“I want this country to be a place where everybody feels safe and secure. This is not just a battle for the Jewish community,” Starmer said. “It is our battle. The Britain that I want is a Britain where people can practice their religion, their faith, in safety and security.”

British counter-terrorism police on Wednesday made two further arrests over an alleged plot to carry out an arson attack on a Jewish-linked site in London.

Detectives arrested two men aged 19 and 26 in Watford, northwest of London, on Tuesday, police said. Both remain in custody.

Police did not name a specific location but said the intended target was connected to the Jewish community.

Seven other people arrested earlier in the investigation have since been released on bail, London’s Metropolitan Police said.

British police have been investigating the string of attacks as part of a wider rise in antisemitic threats and criminal activity since the outbreak of the Israel-Hamas war in Gaza in October 2023.