Iqbal and Khan, both from Leyton, and the 17-year-old from Walthamstow, who cannot be named for legal reasons, are due to appear at Westminster Magistrates’ Court on Saturday.
Counter-terror police are leading the investigation, but the incident “has not been declared as terrorism” at this stage, the Met said.
Cdr Helen Flanagan, head of Counter Terrorism Policing London, said: “Since this appalling attack last week, we have been working continuously to investigate and identify those responsible.”
She said the support from the local community since the attack took place had been “incredible”.
The ambulances were run by Hatzola, a Jewish volunteer-led group which treats patients regardless of faith.
Police patrols have been stepped up in areas with large Jewish populations since the attack.
