Magen David Adom, the Israeli emergency service, said that at least 44 people were killed during the event early on Friday.
Zaki Heller, spokesman for the Magen David Adom, said that among the 150 people who had been hospitalized, six were in critical condition.
On social media, Israeli Prime Minister Benjamin Netanyahu called it a “heavy disaster” and added, “We are all praying for the wellbeing of the casualties.”
The stampede occurred as tens of thousands of mainly ultra-Orthodox Jews were participating in an annual pilgrimage for the feast of Lag BaOmer, in Mount Meron (Jabal al-Jarmaq), around the reputed tomb of Rabbi Shimon Bar Yochai, a second-century Talmudic sage.
The incident began when large numbers of people trying to exit the site thronged a narrow tunnel-like passage, according to witnesses. People began falling on top of each other near the end of the walkway, as they descended slippery metal stairs, witnesses said.
Israeli media published an image of a row of bodies covered in plastic bags on the ground, Al Jazeera reported.
Authorities had authorized 10,000 people to gather at the site of the tomb but organizers said more than 650 buses had been chartered from across the country, bringing at least 30,000 pilgrims to Mount Meron.