The death toll following a crush at the annual Hajj pilgrimage in Saudi Arabia is now 769 and the number of injured has risen to 934.
Witnesses claimed police had closed entrances and exits to the pilgrims' camp, making the disaster inevitable, while Iran's Supreme Leader accused authorities of "mismanagement".
King Salman has ordered an immediate review into safety procedures.
Iran's supreme leader has called on the Saudi government to accept responsibility for a crush that killed more than 700 worshippers outside Mecca.
Ayatollah Ali Khamenei alleged that "mismanagement and improper actions have caused this catastrophe".
Iran's state news agency IRNA has reported that at least 95 Iranians were among the dead following the disaster.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.