Iran has vowed to take international legal action against Saudi Arabia’s rulers over the crush of Muslim pilgrims at this year’s hajj, which killed at least 769 people, including 136 Iranians.

Saudi Arabia, under growing pressure to account for a crush that killed more than 700 people at the hajj pilgrimage, suggested pilgrims failing to follow crowd control rules bore some blame for the worst disaster at the event for 25 years.