The British PM said additional security measures alone will not prevent attacks.
“We must also deal with the forces that drive this hatred in the first place, so we’re confronting them directly,” he said.
“One of the lines of inquiry is whether a foreign state has been behind some of these incidents. We’re investigating, of course, all the possibilities and we’re clear that these actions will have consequences if that proves to be the case,” Starmer added.
Counterterrorism officers were investigating a suspected arson at a former synagogue in east London Tuesday morning, the Met police said in a statement.
That attack comes after two Jewish men were stabbed in Golders Green, north London, last Wednesday. A 45-year-old man, Essa Suleiman, has been charged with attempted murder.
Four ambulances from the Jewish community service Hatzola were attacked in March, and seven people were arrested last month on suspicion of conspiracy to commit an arson attack targeting the Jewish community.