Which event led Gandhi to withdraw the Non-Cooperation Movement in February 1922?

When a mob burnt a police station at Chauri Chaura in Uttar Pradesh on 5 February 1922, killing 22 policemen, Gandhi felt the movement had turned violent and called it off. The Moplah rebellion (1921) was in Malabar, the Bardoli resolution was the decision to suspend it, and the Kakori train robbery took place in 1925, after the withdrawal.