The incident comes after four ambulances belonging to the Jewish emergency volunteer medical service Hatzola were set on fire in north west London in March. Two men and a 17-year-old boy were charged with arson earlier this month.
Detective Chief Superintendent of the Met Luke Williams said: “I hope the swift action by officers today to identify and arrest two people provides some reassurance and demonstrates how seriously we take attacks of this nature.
“However, we understand the significant concern the Jewish community will feel at another incident so soon after the arson attack on four ambulances in Golders Green.
“There is no suggestion the matter in Finchley and the incident in Golders Green, for which three people have been charged, are linked. Our increased patrols in the Finchley area continue, and I would ask that anyone with concerns speaks to my officers.”