Anti-Semitic graffiti was spray-painted on the walls of a synagogue and nearby stores in north London during Hanukkah.
Police said they have launched an investigation into the suspected hate crime, which was carried out only hours after five people had been stabbed while celebrating Hanukkah at rabbi's house in New York.
The Star of David and the numbers “9 11” were spray-painted on several properties including South Hampstead Synagogue. The graffiti references an anti-Semitic conspiracy theory related to the 9/11 terror attack.
Scotland Yard released a statement it is "investigating a racially motivated hate crime in the Hampstead area," but so far no arrests have been made.
"This is clearly a concerning incident and one we are taking seriously," Inspector Kev Hailes said.
"We have liaised with our partners in order to remove the graffiti and various enquiries are underway to find who is responsible.
"Officers will be on patrol throughout the area in order to provide some reassurance to local communities. Please approach us if you have any questions or concerns," the inspector added.
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Oliver Cooper, a Hampstead council member, shared the malicious images on Twitter, saying he was "sickened" by the act of hate.
"We must move heaven and earth to eradicate this racist hatred, which was unimaginable just a few years ago," he told the Standard.
"I am walking around Hampstead documenting all the anti-Semitic graffiti that mars our community this morning and just got to South Hampstead Synagogue," Copper wrote on Twitter.
"This is a place of peace and prayer, desecrated by the world’s oldest hatred," he added.
The Associated Press contributed to this report.