Millions of Iranian Shiite pilgrims are walking towards the holy city of Mashhad to attend the mourning processions which marks the martyrdom anniversary of the eighth Shiite Imam, Ali ibn Musa al-Reza (AS).
Black-clad mourners from various social classes and age groups as well as Shiites from other countries will come together in Mashhad mosques as well as places of worship and religious sites nationwide to observe the rituals on the anniversary of Imam's martydom.
