Arba'een ceremony in Tehran

TEHRAN, IRAN - DECEMBER 02: Iranians gathered at Imam Hossein Square walk towards the Shah-Abdol-Azim Shrine during the Arba'een ceremony in Tehran, Iran on December 2, 2015. Hundreds of worshippers attend religious ceremonies in Tehran on the anniversary of the 40th day after the martyrdom of Imam Hussein, grandson of Prophet Mohammad who was killed in the Battle of Karbala in 681AD. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)