Another 30 worshippers were injured, according to the country's Civil Defence Authority, late on Friday.
Social media images shared online appear to show part of a huge crane that had fallen through the roof of the mosque. It is thought to have been brought down by a huge storm currently buffeting Mecca.
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Saudi Arabia is preparing for the Hajj pilgrimage season, during which hundreds of thousands of Muslims are expected to journey to the city this month.
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