What were the circumstances which led to Jallianwalla Bagh incident?

What were the circumstances which led to Jallianwalla Bagh incident? Describe in brief the reaction of the people immediately after the incident.

Circusmstances that Created Jallianwala Bagh Incident The Rowlatt Act (1919) was passed by the British government despite the united opposition of the Indian members. This Act gave enormous powers to the government to repress political activities and allowed detention of any person without trial for two years.
Gandhiji wanted non-violent civil disobedience against such unjust laws. Rallies were organised in different cities. Alarmed by the popular upsurge, British administration imposed martial law in Amritsar. On 13th April, 1919, General Dyer fired at the innocent people who gathered in Jallianwalla Bagh killing hundreds.
Reaction of People As the news spread, crowds took to the streets and there were strikes, clashes with the police and attacks on government buildings.