Antisemitic graffiti has been daubed on a synagogue and several shops in north London during the Jewish festival of Chanukah.
The Star of David and 9/11 were spray-painted in Hampstead and Belsize Park, referencing a conspiracy theory.
South Hampstead Synagogue was among the premises targeted, with reports made to police on the night of December 28.
Police are treating it as a racially motivated hate crime.
The graffiti references an antisemitic conspiracy theory that Jews are responsible for the 9/11 terror attack. It could also reference Kristallnacht, an organised nationwide attack on Jews which began in Germany on 9 November 1938.
Mayor of London Sadiq Khan said on Twitter: “This makes me sick to my stomach” adding that “antisemitism like this” had “no place anywhere and certainly not in London”.
He also said that residents could expect more police patrols in the area.
A South Hampstead Synagogue spokesman said: “This is a time for people of all backgrounds – of all faiths and of none – to stand united and show our determination that we do not tolerate prejudice, hate and division – on our streets or online.”
The graffiti was seen being removed from shop windows on January 29.