CCTV footage from some of the affected sites showed a white male of medium build with a close-cropped beard, and wearing a dark hooded jumper carrying out the vandalism.
CCTV footage of the suspect in one of the earlier attacks Shomrim
It is not clear whether this attack was carried out by the same suspect or a copycat.
A Shomrim spokesperson said: “The desecration of another local synagogue and a children’s nursery with excrement is a vile and deliberate and premeditated act of antisemitism.
"This marks the eighth attack in just over a week, to directly target the local Jewish community.”
These were seven faeces attacks and one unconnected instance of a man shouting antisemitic abuse in the street
"These repeated attacks have left our community anxious, hurt, and increasingly worried,” the group added.
"Shomrim is working hand in hand with police to analyse CCTV and gather evidence so the suspect can be caught and brought to justice.”
Anyone with information or who may have been affected by similar incidents is urged to contact Shomrim’s 24-hour control room on 0300 999 1234 or the Metropolitan police on 101.
Those who wish to make an anonymous report can contact CrimeStoppers on 0800 555 111.