Detectives from The Metropolitan Police are appealing for witnesses after a series of robberies in Woodford Green.
The latest offence occurred on Sunday, 24 January at approximately 4pm in the Roding Valley Park area, where a woman was robbed at knife point.
The victim was walking on Roding Valley Park Trail while talking on her phone when a man approached her and threatened her with a knife.
He shouted at her to hand over her phone and the security details to the phone. The victim handed her phone over to the suspect and the robber began to run away.
Some passers-by witnessed this incident and so attempted to chase the suspect. The robber 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