The ignited container landed in the car park of Volant Media, the parent company of Persian news channel Iran International, where the fire quickly went out.
The SUV was then seen leaving the scene and was later pursued by police before it crashed on Ballards Lane, where arrests were made.
The two men and the boy remain in police custody.
A number of nearby buildings were evacuated as a precaution, but were quickly reopened after police confirmed there was no wider risk to the public.
While the incident is not being treated as terrorism, detectives from Counter Terrorism Policing London are leading the investigation, supported by local officers.
The Metropolitan Police said the attack is not currently believed to be linked to Wednesday’s attempted arson at a synagogue in Finchley, or to last month’s arson attack on four ambulances belonging to the Jewish community charity Hatzola in Golders Green.