Explanation: Jallianwala Bagh Massacre (April 13, 1919): Amritsar was the worst affected by violence. In the beginning there was no violence by the protestors.

• Indians shut down their shops and normal trade and the empty streets showed the Indians’ displeasure at the British betrayal.
• On April 9, two nationalist leaders, Saifuddin Kitchlew and Dr Satyapal, were arrested by the British officials without any provocation except that they had addressed protest meetings and taken to some unknown destination.

Source: Spectrum