Two more arrests have been made by counter-terrorism police after an alleged plan to commit arson at an unknown site connected to the Jewish community.
The Metropolitan Police said a 19-year-old man and a 26-year-old man were arrested in Watford on Tuesday and remain in police custody.
A total of nine people have been arrested over the past three days as part of the investigation. The other seven have been released on strict bail conditions, the Met said.
Assistant Commissioner Vicki Evans, senior national co-ordinator of Counter Terrorism Policing, said: “We are continuing to identify and arrest suspects who we believe were involved, or planning, the recent arson attacks in north-west London.”