What factors contributed to the outbreak of riots in the 1960s?

The people became hopeless and they were tired waiting for change. Also, they became tired asking for help and they even observed that for a non-violent approach, there's a very little output. They cannot get answers to their questions and continuously get rejected.

These revelations are recorded in the Qur'an, the holy book of Islam. There are two main branches in Islam: Sunni and Shi'a. A split occurred shortly after the death of Muhammad over the question of who was to lead the Muslims. The Shi'a believed that Muhammad pre-selected Imam Ali, his cousin and son-in-law.