A bus carrying Pakistani pilgrims overturned in central Iran, killing 28 passengers and injuring another 23 people, state media reported on Wednesday.
The accident took place late on Tuesday in the central Iranian province of Yazd and was caused by a technical defect in the bus braking system, according to preliminary investigations made by the Iranian traffic police.
"Unfortunately, 11 women and 17 men lost their lives in this accident. Seven of the injured people are in critical condition and six injured people have now left the hospital," the crisis management director general of Yazd province told state TV.
Pakistan's consular services in Iran have been invited to Yazd province to follow up on the accident, the official added.
Millions of Shia Muslims are currently partaking in the Arbaeen pilgrimage in Iraq's Karbala Governorate.
The event marks the 40th mourning following the martyrdom of Imam Hussein bin Ali, a central figure in Shi'ite Islam and the grandson of Prophet Muhammad.

Saudi Arabia says 2 airports targeted as fighting with Yemen's Houthis escalates
Indian opposition marches in protest seeking resignation of election chief
Cornell students stage rally in support of 'Jane Doe'
Dozens quarantined in Siberia after plague institute lab worker dies
US, German scientists win Nobel medicine prize for work on light and brain