Man arrested on suspicion of preparing terrorist acts on Jewish sites in London as counter terror police probe involvement of Iran proxies

The Met Police added that 26 people have now been arrested since late March.

There have been arson attacks on Jewish community-run ambulances in Golders Green, north-west London, a synagogue and a former Jewish charity, as well as an incident where a drone was flown near the Israeli embassy.

Counter-terror police have been looking into the possible involvement of Iranian proxies.

On Tuesday, a 17-year-old boy pleaded guilty at Westminster Magistrates’ Court to arson not endangering life following the attack on Kenton United Synagogue.

Speaking at the Kenton United Synagogue during a visit on Thursday afternoon, Sir Keir Starmer said: "We have to deal with malign state actors, that will require legislation. We’re going to bring that legislation forward.

"It’s really important we do that. It’s very important this particular context because I’m increasingly concerned that a number of countries are using proxies for attacks in this country."

At a roundtable discussion with leaders of the Jewish community, including Chief Rabbi Sir Ephraim Mirvis and those local to the Kenton United Synagogue, the Prime Minister said the fight they face to practice their religion freely is "all of our fight".

He said: "I pointed out to him that we are appreciative of all the measures that are being taken by the police, by our CST (Community Security Trust), by various authorities, however the focus is primarily on treating the symptoms and not the cause.

"We need as a society to look at the cause and our Government needs to direct its attention in order to guarantee that the Islamist threat, not just to the Jewish community but to our entire society, is something that will be taken far more seriously.

"We need to be worried about the extent to which Israel has been demonised unfairly and as a result our Jewish community is suffering."