Tasu'a mourning ceremonies are underway in Imam Hussein's (PBUH) holy Shrine at Karbala in Iraq. The culmination of the mourning ceremonies will be on Tuesday the 10th of the lunar month of Moharram, the day of Ashura.
Shia Muslims hold mourning ceremonies during the first 10 days of Moharram to remember Imam Hussein and his 72 companions, who were all martyred after fighting thousands of soldiers of the ruling tyrant of the time, caliph Yazid I in Iraq's Karbala desert in 680 AD.
Tasu'a is devoted to Hazrat Abbas ibn Ali (PBUH), Imam Hussein’s half-brother, who made great sacrifices to protect the imam and his family and was eventually martyred on the 10th day of Moharram, or Ashura, shortly before Imam Hussein himself.
He was martyred as he tried to bring water for women and children in Imam's camp, who had no water to drink for days due to a siege by the enemy.