Shiite Muslims observed Ashura, the 10th day of Muharram, with solemn tazia processions across Mumbai on Friday. The day commemorates the martyrdom of Imam Hussain, the grandson of Prophet Muhammad, who was killed in the Battle of Karbala. (Pics/ Ashish Raje)

The tenth day of Muharram, known as Ashura, holds deep religious significance for Muslims. For Shia Muslims, it is a day of mourning commemorating the martyrdom of Imam Hussain at Karbala, while many Sunni Muslims observe the day by fasting