Why do Muslims mourn on Muharram?
Muslims consider Muharram, the first month of the Islamic calendar, to be the holiest month after Ramzan. On the tenth day of Muharram, referred to as 'Ashura', Shia Muslims mourn the death of Prophet Muhammad's grandson, Imam Hussain, in the Battle of Karbala by cutting their bodies, while Sunni Muslims fast to mark the day.