At least 62 people were killed when a crane crashed in Mecca’s Grand Mosque Friday, Saudi Arabia’s Civil Defense authority said on its Twitter account.

It said nearly 30 people were injured as well.

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Pictures circulating on social media showed pilgrims in bloodied robes and masses of debris from a part of the crane that seemed to have crashed through a ceiling.

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The annual Muslim Haj pilgrimage is due later this month, and Saudi authorities go to great lengths to be prepared for the millions of Muslims who converge on Mecca.

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Last year, the kingdom reduced the numbers permitted to perform haj for safety reasons because of construction work to enlarge the Grand Mosque.