The non-cooperation movement began in January 1921 as a result of Gandhi's support for the Khilafat cause and goal of attaining self-government. It aimed to resist British rule through non-violent means, and various social groups participated with different aspirations. Students left schools, lawyers quit, and goods were boycotted. Peasant movements also arose but sometimes turned violent. The movement ended in February 1922 following the Chauri Chaura incident where a police station was burned down killing 23 policemen, after which Gandhi halted the movement.