Police are appealing to trace a male following 22 reports relating to a series of linked sexual assaults in the Hackney Marshes area.
The suspect is described as a light skinned male, possibly mixed race, aged 16-17, who is usually wearing a grey tracksuit.
An e-fit image of him has been released to aid the public in identifying the suspect to police.
Detectives received the 22 complaints between February and June 2022 - but believe there could be further incidents.
The attacks are said to be of a very similar nature on each occasion.
Lone women have been out either walking or jogging when they have been approached by a male on a bicycle who has grabbed their buttocks from behind, or touched their genitals, before making inappropriate comments and riding off.
DC Hannah Rodericks, from the Met Police, said: "I understand this news may cause considerable concern among the community.
“We in the Central East Command Unit share that concern and are doing everything we can to identify and bring to justice the person responsible.
"It is imperative that he is identified but we need the public’s help.
“ Anyone who has information that they think can help us is urged to make contact immediately."
Anyone who has information that could help police should call 101 ref 4216097/22.
Alternatively tweet @MetCC, or to remain 100% anonymous contact the independent charity Crimestoppers on 0800 555 111.