Tehran: Iranian officials escalated their criticism of Saudi Arabia's Haj pilgrimage after at least 717 were killed in a stampede near the holy city of Mecca last week.

The Islamic Republic plans to sue the kingdom at international legal bodies, Prosecutor General Ibrahim Raeesi said, according to state-run television.

More than 130 Iranian pilgrims were killed in the worst Haj disaster in a quarter century in Mina, an encampment outside Mecca.