What were the causes of withdraw …

Non Cooperation movement was launched by Gandhi who believed in the principles of truth and non violence. It was felt that movement was turning violent in many places. In 1922, when a mob in Chauri Chaura in United Provinces (present Uttar Pradesh) burned the Police station and killed 22 policemen. Gandhi belie that people were yet not prepared to launch a non violent movement and hence withdrew it.

Withdrawal of Non-Cooperation Movement in February 1922: 

(i) Gandhiji felt the movement was turning violent in many places. 

(ii) A clash took place at Chauri Chaura in Uttar Pradesh 

(iii) A group of volunteers picketing a liquor shop were beaten up by a police officer. 

(iv) In protest a group of peasants went to the police station, bolted the door and set fire to the police station killing 22 policemen. 

(v) The incident shocked Gandhiji and he immediately withdrew the movement.