Two teenagers were robbed for their mobile phones on Monday by a man who said he had a knife.

Police said the girl and boy, both 15, were chatting behind Simmons newsagents, in Fencepiece Road, Hainault, when they were approached by a man who demanded they hand over their phones.

He then escaped with a white iPhone 5 and a black Samsung Galaxy down Fencepiece Road towards Barkingside.

He is described as white, aged between 20 and 25 and 5ft 10in tall. He was wearing a black T-shirt with grey jogging bottoms and had short black hair, stubble and spoke with an Irish accent.

Anyone with information should call Ilford robbery squad on 020 8345 2680 or Crimestoppers anonymously on 0800 555 111.