The Cardiff Ely bread riots, or Ely petrol riots, was the outbreak of violence that occurred in the council suburb of Ely in the capital of Wales, Cardiff, during September 1991. The unrest was attributed to a dispute between two shopkeepers over who could sell bread and other food products which escalated into a riot involving up to 500 participants. An estimated 175 police officers were mobilised, including reinforcements called in from the Vale of Glamorgan, to deal with the unrest.