Commander Helen Flanagan, the Metropolitan Police’s head of counter-terrorism policing, said: “Since this appalling attack last week, we have been working continuously to investigate and identify those responsible.
“We know concern among the Jewish community remains high, but I hope these arrests show that we are doing everything we can to bring those responsible to justice.”
The ambulances were owned by Hatzola Northwest, a Jewish charity that provides free emergency medical care and hospital transfers. It has operated in Golders Green, home to one of Britain’s largest Jewish communities, since 1979.
Israeli embassy sources previously told The Telegraph that the firebombing had the hallmarks of an Iran-backed attack.
Harakat Ashab al-Yamin al-Islamiyya, a new Islamist militant group linked to Iran, appeared to claim responsibility for the arson in an online video. It also claimed responsibility for attacks across Europe, including in Belgium and the Netherlands, in the past 10 days.
An internal report by the Israeli government, seen by The Telegraph, said the group probably hired local criminals online to carry out the attacks.