Police are investigating after a woman was robbed at knifepoint.

Metropolitan Police says the incident occurred in the Roding Valley Park area in Woodford Green around 4pm on Sunday, January 24.

The victim was walking on Roding Valley Park Trail whilst talking on her phone when a man approached her and threatened her with a knife, the force said.

He shouted at her to hand over her phone and its security details, police said.

The victim handed her phone over to the suspect and the suspect began to run away.

Some passers-by witnessed this incident and so attempted to chase the suspect, police said.

The suspect eventually threw the phone on to a path and continued to run away.

The suspect is described as a black man, aged around 18-years-old, and wearing a black hat and black clothing with a possible blue stripe down the side of his tracksuit bottoms.

Police are asking for any witnesses to this incident or anyone with information that may help to call 101 quoting reference 4401456/21.