ISNA | Ahmad Zohrabi, Amir Harirchi, Soheil Faraji and Masoud Mohaghegh: Millions of people in Iran mourned the martyrdom of Abbas ibn Ali, brother and most beloved companion of the third Shia Imam, Hussein ibn Ali (AS) on the day of Tasou'a, the 9th day of the lunar month of Muharram, the eve of the martyrdom anniversary of Imam Hussein (AS).