The massacre at the Qissa Khwani Bazaaz in Peshawar, British India (modern day Pakistan) on 23 April 1930. Estimates at the time put the death toll from the shooting at between the official count at 20, and the figure of 400 dead put forth by Pakistani and Indian sources.
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As mentioned/referenced from BBC and WiKipedia.
https://www.bbc.com/urdu/pakistan-47924634
https://en.wikipedia.org/wiki/Qissa_Khwani_Bazaar_massacre