City of London Police say anyone with information should call 020 7601 2222, or Crimestoppers, anonymously, on 0800 555 111.
More top news
London Ambulance Service has more paramedic job vacancies than anywhere else in England.
Hundreds of people march for more affordable homes and control private rents in London.
Police proposals suggest that all frontline police officers should have the option of arming themselves with Tasers.