He added he saw ambulances come out “one after the other”.
Zaki Heller, a spokesman for the Magen David Adom rescue service, said 150 people had been hospitalised, several dozen in a serious or critical condition.
A pilgrim who gave his name as Yitzhak told Channel 12 TV: “We thought maybe there was a (bomb) alert over a suspicious package.
“No one imagined that this could happen here. Rejoicing became mourning, a great light became a deep darkness.
“Rabbi Shimon used to say that he could absolve the world… If he didn’t manage to cancel this edict on the very day of his exaltation, then we need to do real soul-searching.”