The death toll of Iranians killed at the disaster at the hajj in Saudi Arabia last week has risen to 464, Iran Hajj and Pilgrimage Organization said on Thursday.

"Seven days after the incident and after visiting hospitals [in Saudi Arabia] ... we sadly announce that number of Iranians died is 464," the Haj Organization said in a statement published on state TV website IRIB.

Iran's supreme leader has said Saudi Arabia should apologise for a crush outside the Muslim holy city of Mecca that killed 769 worshippers performing the annual haj pilgrimage, Khamenei's website said on Sunday.