Anti-Semites sprayed Stars of David and “911” throughout North London neighborhoods, referencing a bizarre conspiracy theory blaming Jews for the 2001 Islamic terror attacks in the U.S.

London residents woke up Sunday morning to red Stars of David painted on synagogues and Jewish establishments in the Hampstead and Belsize Park neighborhoods.

The graffiti included not only traditionally Jewish symbols, but also “911,” which is shorthand for an anti-Semitic conspiracy that blames Jews for perpetrating the September 11, 2001 terror attacks in the U.S., which were in reality the acts of Islamic extremists.

The U.K. is still reeling from an election campaign in which the Labour party was exposed for harboring virulent anti-Semites among its ranks. Party leader Jeremy Corbyn also faced personal accusations of anti-Semitism based on his positions on terrorists who seek the annihilation of the Jewish state.