The victim, 64, was knocked unconscious during the incident, according to local reports.
He was rushed to hospital with a broken ankle and head injuries, according to local Jewish neighbourhood watch Shomrim.
The neighbourhood watch group, which works to protect the Jewish community of Stamford Hill, posted a clip from the scene onto social media on Friday.
Footage of the incident appeared to show a man in Orthodox Jewish dress being punched by another man.
The official group wrote on Twitter: "Shocking footage of a vicious Racist attack, the unconscious victim, was rushed to hospital with broken foot/ankle & nasty head injuries.
"MPSHackney specialist HateCrime officers are keen to speak to this male."
Holmdale Terrace #N16#Racist attacker strikes again!#Jewish child viciously punched in the face 18 Aug 7:10pm@MetPolice @MPSHackney detectives are linking a series of horrific unprovoked attacks this Wednesday evening
CAD 6568 20/08/21 pic.twitter.com/5EeW3BuYjQ
— Shomrim (Stamford Hill) (@Shomrim) August 20, 2021
The Metropolitan Police said: "On Friday, August 20 police received a third party report of an assault that occurred on Stamford Hill at approximately 8.30pm on Wednesday, August 18.
"Officers have spoken with the 64-year-old victim and inquiries remain ongoing.
"There have been no arrests."
Anyone with information about the incident is asked to call police via 101 quoting reference Cad 4492/20Aug.