In the past, pilgrims were often targeted by bombings that killed dozens, including a wave of attacks against pilgrims the day before the peak of Ashura rituals last year that killed 28 people and wounded 78.
And while there were two attacks against pilgrims this year, the violence was much lower than before.
A roadside bomb wounded 10 pilgrims east of Baquba in Diyala province on Sunday, police and a doctor said, while a car bomb targeted pilgrims north of Baghdad on November 17, killing three people and wounding 25.
Attacks also hit Ashura commemorations elsewhere in the Muslim world.
Soil of Imam Hussain's grave transformed to blood in the day of Ashura:
Attacks against Shiites kill eight in Iraq