ShareSaveAdd as preferred on GoogleBBCTwo people have been arrested on suspicion of arson with intent to endanger life after a memorial wall in Golders Green, north London, was damaged on 27 April.
The Metropolitan Police said a 46-year-old man and a 38-year-old woman were arrested on Monday morning as part of a counter-terror policing investigation.
The two suspects, who were arrested in Romford, remain in custody at a London police station.
Commander Helen Flanagan said police are "committed to protecting vulnerable communities in the capital".
The wall in Golders Green was used as a space to display photos of protesters killed by the Iranian government during a crackdown on demonstrations in January.
A section also commemorates those killed in the 2023 Hamas attack on the Nova music festival in Israel, with a more recent message of solidarity with the Jewish community attached to a nearby tree.
The Met said it was continuing its investigation into the incident and officers were searching an address in Romford.
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