Saudi security forces will be "authorized to take all measures against anyone who tries to break the law and cause disorder," the ministry said, according to the country's state-run news agency.

The government cited how some were trying "to get around the systems" and "achieve illegitimate goals."

The Interior Ministry spokesman said that kingdom law prevents all kinds of demonstrations, protests, strikes and even a call for them because they're against Sharia law and Saudi values and traditions.

Demonstrators who protested in Eastern Province were demanding the release of Shiite prisoners they feel are being held without cause.

An outspoken Shiite prayer leader who demonstrators say was arrested more than a week ago was a focal point of the "day of rage" protest, said Ibrahim al-Mugaiteeb, president of the Human Rights First Society.

The protests come as sectarian violence between Shiites and Sunnis flares in neighboring Bahrain.