In the first attack on the night of August 1, a 31-year-old man was cycling when he was approached by four men on bikes with their faces covered with scarves and their hoods up.
After blocking the victim's path, they repeatedly punched him in the face and stole his phone and wallet. The gang also threatened to stab him during the shocking attack.
Minutes later, a 39-year-old cyclist was attacked at nearby High Hill Ferry. The suspects pushed him off his bike, punching and kicking him as he lay helpless on the ground, before stealing a bank card, watch, necklace and his house keys.
The following day another three men were attacked at about 11.30pm near the Springfield Marina. Police said they were approached by three black suspects on bikes who assaulted them, with one victim threatened with a large kitchen knife which was held to his throat.Their phones and bank cards were stolen.
In the early hours of Friday morning a 39-year-old cyclist was targeted near Crescent Rowing Club. He was approached by a group on bicycles, who chased him but ultimately fled empty-handed.
Scotland Yard officers are now appealing for information about the attacks.
Detective Inspector Paul Ridley said: “The brutality the robbers have used is very concerning, holding a knife to the throat of one of the terrified victims and subjecting others to violent attacks.
“The robbers appear to be targeting canal path users which provides rapid access and escape routes, particularly when using a cycle.
“The canal towpath is likely to be busy, especially over the course of the weekend. Please remain vigilant and if you see any individuals of concern, call police immediately. Do not attempt to challenge the robbers, there is a distinct possibility they will be armed.
“If you have been the victim at the hands of these men and have not already informed us, please come forward. I would also like to appeal to the boating community in the area to inform my investigation team if they have any information.
“I would like to reassure residents that patrols have been stepped up and officers are on alert.”