TEHRAN, IRAN - OCTOBER 01 : Muslim devotees cover themselves with mud as they take part in a mourning procession marking the day of Ashura in Tehran, Iran on October 01, 2017. Muslims are observing the Ashura, the tenth day of the first Islamic month of Muharram, to commemorate the martyrdom of Prophet Muhammad's grandson Imam Hussein (Husayn Ibn Ali) and his accompanies, who were killed in the battle of Karbala in modern day Iraq in 680 AD. Fatemeh Bahrami / Anadolu Agency