It was planned by KSA ...
just look at some of Iran causalities ...
-- IRGC General Moshaf'feq ( is missing -- some sources are saying that KSA kidnapped him in middle of chaos )
-- IRGC General Fooladgar
-- IRan former ambassador in Lebanon , Mister Rokn Abadi ( he survived some terrorist attack in past years )
-- An High ranked Scientist in Iran Aerospace and Missile Program ....
-- and several more Officials who are missing ...
and now KSA doesn't want to give back bodies to Iran and want to bury then in mass graves ...... why !? to cover everything up ....
we knew what they are , but , doing this in middle of Haj was above our exception ...
Source:
Hajj stampede beyond human control, 'destiny is inevitable', says top Saudi cleric | Page 6