Why did Mahatma Gandhi withdraw the Non-Cooperation Movement in 1922?

The Non-Cooperation Movement was withdrawn by Mahatma Gandhi after the Chauri Chaura incident, where a violent mob set a police station on fire, leading to the death of 22 policemen. Gandhiji felt that the movement was becoming violent in many places. He strongly believed in peaceful and non-violent protest, and the violent turn of events deeply distressed him.