In the celebration of their annual Ashura festival, thousands of Muslims have cut open their heads with swords to let the blood flow all over their bodies.
The Ashura ceremony is used to commemorate the death of Prophet Mohammed’s grandson, Husayn ibn Ali.
To mark the ceremony, people would cut themselves with knives and swords, with many believing that the bloodletting would cleanse their sins.
It is also seen as a way of showing respect and grief for Husayn ibn Ali and his family, who were killed alongside him.
The bloodletting ritual is known as Tatbir and is has become controversial with some Shia Muslims, who claim it is self-harm and therefore forbidden.
A re-enactment of the battle took place in Baghdad yesterday, with hundreds of actors in traditional costumes fighting each other.
It has started becoming a practice for people to donate blood in hospitals when the ceremony is approaching in case of casualties.
Despite the dangers inherent in the practice, may still take part in it including children.