Police in Haringey are appealing for information after anti-Semitic graffiti was sprayed on walls near Stamford Hill, home to some 30,000 orthodox Jews.
Police were called at 10.35pm on 6 July to reports of the racist graffiti that had been sprayed onto a wall in Vartry Road.
According to the Campaign Against Anti Semitism, the graffiti was in Polish and included a Star of David.
The letters "RTS" - an apparent reference to RTS Widzew Łódź SA, a football club - and the words "Zydzew Zdychaj" also appear.
"Zydzew" is a combination of the name of the club with the Polish word for "Jew" and "Zdychaj" means "dies".
The following day, police received a call at 1.50pm to reports of more anti-Semitic graffiti on a wall in Richmond Road, N15.
An investigation has been launched by detectives from the Community Support Unit, who at this early stage are linking the two incidents. No arrests have been made and enquires continue.
Racist and religious hate crime increased by 25.7% across London in 2014/15 but the Metropolitan Police said the rise was due to new crime recording and a willingness of victims to report hate crime.
Earlier this year the Community Security Trust said Jews across the UK suffered the most anti-Semitic abuse ever recorded in 2014 as violence in Israel and Gaza escalated.
The largest spike was in London, where the number of incidents rose by 137% to 583.
Some of the incidents reported to the Community Security Trust:
An act of "extreme violence" where a victim was called a "Jewish c***" and then hit with a glass and a baseball bat in London.
In London, two men entered a Kosher restaurant, made a Nazi salute and shouted: "Heil, Adolf Hitler" before grabbing a diner in a bear hug.