Riyadh, Jul 22 (AP): Saudi authorities warned non-Muslim expatriates on Friday, the first day of Ramadan, not to eat, drink, or smoke in public until the end of the Muslim holy month's sunrise-to-sunset fast - or face expulsion.

The Interior Ministry of the oil-rich kingdom called on expatriates to "show consideration for feelings of Muslims" and "preserve the sacred Islamic rituals." Otherwise, a ministry statement said, Saudi authorities will cancel violators' work contracts and expel them.

Saudi Arabia's population of 27 million includes some 8 million expatriates, including Asians, Arabs, and Westerners, according to government figures.

The ultraconservative Sunni kingdom is the home of Islam's holiest sites. The warning - which is issued at the beginning of Ramadan every year - serve as a reminder that the Western-allied monarchy must answer to a strict religious establishment that holds de facto veto power over many of its policies.

With challenges to the established order growing bolder from a population nearly half of which is under 30, Saudi Arabia has recently made some moves to show moderation. It is sending female athletes to the Olympics for the first time this year. King Abdullah has promised to allow women to run and vote in municipal elections in 2015. He also has tried to rein in the country's feared morality police.

But Saudi rights advocate Waleed Aboul Khair believes that while such moves give impression that the grip of hardliners has eased, "when you look around, nothing has changed and suppression has not changed." He is facing trial for "tarnishing the kingdom's reputation," mostly by his political activism for women's rights and other issues.

Warnings or no warnings, he says, "expatriates are always at risk of expulsion for the least offense in the kingdom."

The prince newly appointed to handle most aspects of law enforcement is known as a strict adherent to religious rules. Prince Ahmed bin Abdulaziz was governor of the holy city of Mecca before becoming Interior Minister.

Saudi Arabia is wary of the wave of Arab Spring uprisings that has toppled long-time authoritarian leaders in Egypt, Libya, Tunisia and neighbouring Yemen.

It followed a carrot-and-stick strategy to contain unrest by pledging around $120 billion for the kingdom's lower income groups. It has heavily cracked down on protests, especially in eastern regions dominated by Shiites demanding greater rights, and is steering a middle course between conservatives and reformers among the Sunni majority.