On 10th April 1919; in Amritsar; the police fired upon a peaceful procession. This provoked widespread attacks on government establishments. Martial law was imposed in Amritsar and the command of the area was given to General Dyer.
The infamous Jallianwalla Bagh massacre took place on 13th April; the day on which Baisakhi is celebrated in Punjab. A crowd of villagers came to participate in a fair in Jallianwalla Bagh. This was enclosed from all sides with narrow entry points. General Dyer blocked the exit points and opened fire on the crowd. Hundreds of people were killed in the incident. Public reaction to the incident took a violent turn in many north Indian towns. The government was quite brutal in its response. Things took highly violent turn. Mahatma Gandhi called off the movement as did not want violence to continue.