One of the ancient stones from Jerusalem's Western Wall dislodged and crashed into an adjacent prayer area on Monday. No one was hurt.
Footage shows the block plummeting on Monday and landing on a raised wooded platform used for egalitarian prayer.
Western Wall Rabbi Shmuel Rabinovich called it a most unusual event that hadn't happened in decades. He says moisture or plant growth could have dislodged the stone.
The area containing the section of the wall was fenced off to prevent entry until the Antiquities Authority can examine it. The authority is to map the stones in the coming days in order to preserve them and remove any danger to visitors.
Jerusalem Mayor Nir Barkat hailed the lack of injuries as "a great miracle," adding that he intends to ask the Prime Minister's Office to expand the periodic inspections of the site. "Once the Antiquities Authority's maintenance work is completed, the order will be removed and the plaza will return to the routine that has been customary until now."
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The Western Wall, a remnant of the compound where the biblical Jewish temples once stood, is the holiest site where Jews can pray.
Jews marked Sunday the Tisha B'Av fast commemorating the temples' destruction.