In Holy Karbala in Iraq, millions of believers marked the occasion amid strict security measures.
Moreover, millions of people on Tuesday mourned Ashura all over the world.
In Saudi Arabia, Nigeria, Afghanistan and Pakistan, the Muslims also marked the anniversary of Ashura, despite the terrorist attack that targeted the ceremonies in the Saudi city of al-Ahsaa which claimed over 23 martyrs and that which targeted the Nigerian town of Potiskum which also claimed over 15 martyrs.