The Civil Defense said on Twitter that as many as 238 people had been injured.
Photos sent by Twitter from the scene show numerous blood-covered bodies strewn on a marble floor under the arm of a large crane.
Ahmed bin Mohammed Al-Mansouri, spokesman for the Presidency of the Grand Mosque and the Prophet Mosque, blamed the accident on a “strong sandstorm, winds and torrential rains, Saudi Press Agency says.
The accident occurred as the kingdom prepared to welcome 3 million people to the Muslim holy city for the annual pilgrimage that begins Sept. 21. (USA Today, MSN News, Saudi Press Agency)