An Iranian mourner weeps during a funeral ceremony, attended by thousands of mourners, for some of the pilgrims who were killed in a stampede during the hajj pilgrimage in Saudi Arabia last month. (AP)

A new tally shows at least 1,621 pilgrims were killed in last month's crush and stampede during the hajj in Saudi Arabia.

The latest count is based on totals provided by officials and state media in 19 of the more thna 180 countries that sent pilgrims.

The total is more than double Saudi Arabia's official tally of 769 killed and 934 injured in the September 24 disaster in Mina, a few miles from the holy city of Mecca.

Saudi officials previously have said their tally remains accurate, although an investigation into the causes of the tragedy is ongoing. They have not updated their casualty toll since September 26.

The previous deadliest-ever incident at the hajj happened in 1990, when a stampede killed 1,426 people.