The death toll following a crush at the annual Hajj pilgrimage in Saudi Arabia is now 769 and the number of injured has risen to 934.
Witnesses claimed police had closed entrances and exits to the pilgrims' camp, making the disaster inevitable, while Iran's Supreme Leader accused authorities of "mismanagement".
King Salman has ordered an immediate review into safety procedures.
Saudi authorities have been criticised for a lack of "crowd management" after the latest in a series of disasters during the annual Hajj pilgrimage to Mecca.
Liaqat Hussain, a trustee at Bradford's central mosque who has been on the pilgrimage in the past, told ITV's Good Morning Britain: "There are two million people who have to converge on a site which is very small, maybe 20 square metres in area, and there is no security or direction or help for them."
"People come from various countries, speak various languages - there are no directions in their languages, there are no people who can direct them in their languages," Mr Hussain said.
"This is a result of this lack of crowd management," he claimed.
Saudi King Salman has ordered a review into the cause of the latest disaster, which follows a multi-million pound effort to revamp facilities in the area.
Mr Hussain added that many Brits with family members have been unable to contact their family members, with phone networks swamped and reports that Saudi authorities may have taken some towers out of use.
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