The wall in Golders Green was used as a space to display photos of protesters killed by the Iranian regime during a crackdown on anti-government demonstrations.
Det Ch Supt Luke Williams, who leads policing in north-west London, said: “We recognise that this incident will heighten concerns in the Golders Green area, where residents have already faced a series of attacks.
“Since last month’s attack in Golders Green, we have stepped up our work to reassure communities.
“This includes armed police patrols as well as deployments of officers from Project Servator, who are specially trained to spot anyone who may be planning or preparing to commit criminal acts.”
