No arrests have been made so far
The Metropolitan Police says the victim was subjected to a serious sexual assault in the area of Barnmead Road, in the early hours of Sunday, 4 October.
She is currently being supported by specially trained officers.
The male suspect has been described as white, of slim build, approximately 5ft 8 inches tall and aged in his mid-20s. He was wearing blue jeans, white trainers and a cream round necked jumper, and spoke with an English accent.
Police are conducting urgent enquiries to locate the rapist.
In a statement, the Met said: “If you saw a male of this description or remember any other suspicious activity in the local area at the time please contact police urgently on 101 or tweet @MetCC quoting CAD863/4Oct.
“Alternatively, you can call the independent charity Crimestoppers anonymously on 0800 555 111.”
No arrests have been made so far.
For more on this story, and the latest on our other local and national news, listen to Time 107.5FM
Tags: Dagenham, Barking and Dagenham