The Rawalpindi experiments were experiments involving use of mustard gas carried out by scientists from Porton Down of the British military on hundreds of Indian soldiers. Experiments were carried out before and during the Second World War in a military installation at Rawalpindi, now in Pakistan. These experiments began in the early 1930s and lasted more than 10 years. Since the publication of the story in The Guardian on 1 September 2007, the experiments have been referred to as the Rawalpindi experiments or Rawalpindi mustard gas experiments in the media and elsewhere.