The population of Saudi Arabia is 90% Muslim Arab of the Wahhabi sect (a branch of Sunni Islam), although there is a small percentage of Shiites, mainly in the northeast. Islam is the only officially recognized religion, and other faiths are not publicly tolerated. A large proportion of the population are farmers in the Hejaz. Nomads and seminomads raise camels, sheep, goats, and horses. The large number of foreigners living in Saudi Arabia work in the oil industry, as computer technicians and consultants, and as construction and domestic workers. Arabic is spoken by almost everyone. In 1957 a university was opened at Riyadh; other universities are at Dhahran, Dammam, Jedda, and Makka.