Police are hunting a wannabe armed robber, who fled a bookies empty-handed after demanding cash.
Flying Squad detectives have released this CCTV image of their suspect, who they wish to identify.
The raider entered Paddy Power bookmakers in Barking Road, Plaistow at 12.50pm on February 28.
He threatened staff with what was believed to be a firearm.
Nobody was injured and he fled without any money.
The suspect is described as an Asian male in his twenties.
He was wearing a blue jacket and carrying a green bag.
Anyone with information can contact the Flying Squad on 101 or Crimestoppers anonymously on 0800 555 111.