Water is sprayed to cool off Shiite pilgrims arriving from Iran via the Zurbatiyah crossing in Iraq's Wasit governorate on August 6, 2025, on their way to the shrine city of Karbala ahead of the Arbaeen commemorations. (Credit: Ahmad al-Rubaye/AFP.)
More than 600 pilgrims in Iraq were briefly hospitalised with respiratory problems after inhaling chlorine as the result of a leak at a water treatment station, authorities said Sunday.
The incident took place overnight on the route between the two Shiite holy cities of Najaf and Karbala, located in the centre and south of Iraq respectively.
This year, several million Shiite Muslim pilgrims are expected to make their way to Karbala, which houses the shrines of the revered Imam Hussein and his brother Abbas.
There, they will mark the Arbaeen — the 40-day period of mourning during which Shiites commemorate the death of Hussein, grandson of the Prophet Mohammed.
In a brief statement, Iraq's health ministry said "621 cases of asphyxia have been recorded following a chlorine gas leak in Karbala".
"All have received the necessary care and left hospital in good health," it said.
Security forces charged with protecting pilgrims meanwhile said the incident had been caused by "a chlorine leak from a water station on the Karbala-Najaf road".
Much of Iraq's infrastructure is in disrepair due to decades of conflict and corruption, with adherence to safety standards often lax.
In July, a massive fire at a shopping mall in the eastern city of Kut killed more than 60 people, many of whom suffocated in the toilets, according to authorities.
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