The Nankana massacre (or Saka Nankana) took place in Nankana Sahib gurdwara on 20 February 1921, at that time of British India, in modern-day Pakistan. more than a dozen Sikhs were killed by the Mahant and his mercenaries. The event forms an important part of Sikh history. In political significance, it comes next only to Jallianwala Bagh massacre of April 1919. The saga constitutes the core of the Gurdwara Reform Movement started by the Sikhs in early twentieth century.