The Grand Mosque seizure took place between 20 November and 4 December 1979 at the Grand Mosque of Mecca in Mecca, Saudi Arabia, the holiest site in Islam. The attack was carried out by up to 600 militants led by Juhayman al-Otaybi, a Saudi Islamist opposed to the monarchy, belonging to the Otaibah tribe. The insurgents identified themselves as "al-Ikhwan", referencing the Arabian militia that had played a role in the early formation of the Saudi state in the early 20th century. Scholars refer to them as Juhayman's Ikhwan.