Detectives investigating the murder of a woman who was stabbed have appealed for a key witness to come forward.

The 42-year-old victim was attacked in Bruce Grove, Tottenham, near the junction with Radley Road, just before 1pm yesterday.

She was rushed to a central London hospital where she was pronounced dead.

Officers believe they know the woman's identity but await formal identification. Her next of kin have been informed. A post-mortem examination will be held.

A 46-year-old man was arrested at the scene and taken to a north London police station where he remains in custody.

However, police have yet to establish whether the victim was known to the suspect.

An investigation has been launched by detectives from the Homicide and Major Crime Command, based at Putney, under Detective Chief Inspector Noel MucHugh.

He also made an appeal for a key witness to come forward and to members of the public who may have captured images at the scene to contact them immediately.

DCI McHugh said: "I need to hear from anyone who was in the Bruce Grove area shortly before one o'clock and who may have witnessed the incident.

"I would like to directly appeal to anyone who may have captured images or footage before and after the incident to contact us immediately.

"In particular we would like to speak to a black male who was wearing a white tracksuit top who witnesses saw taking images at the scene.

"He is not a suspect but we urge him to get in touch with us as soon as possible.

"I would appeal to him or anyone else to contact us with the footage or images they took as a matter of urgency and not to upload them on the internet or share them with friends as it may harm our investigation."

Anyone with footage, images or information should call the incident room on 020 8785 8099. To remain anonymous call Crimestoppers on 0800 555 111.