Police have launched an investigation after a woman was sexually assaulted. 

Detectives from the Sexual Offences Exploitation and Child Abuse Command are investigating a sexual assault on a 21-year-old woman in The Crescent, Walthsmstow. 

The attack happened sometime between 1am and 1.30am on Wednesday. 

The property, a section of the pavement and the road was taped off from around 7am. 

Police have now left the scene but are appealing for witnesses or anyone with information to contact the incident room on 0208-217-6541 or call Crimestoppers anonymously on 0800 555 111.

No arrests have been made and enquiries continue.