ISNA |Alireza Massoumi: People of the northeastern Iranian city of Mashhad celebrated the night of Eid al-Ghadir in the city and Imam Reza (AS) holy shrine on Monday. The auspicious occasion marks the day when the Prophet of Islam appointed Ali ibn Abi Talib (PBUM) -- the first Shia Imam -- as his successor and Muslims� next leader.