Saudi cyber activists have created a group on Facebook calling for a "Day of Anger" on Friday in the eastern Shiite-majority region following the arrest of a Shiite cleric.
The group of more than 500 members is calling for protests after Friday prayers in Al-Hufuf, in Eastern Province's Al-Ihsaa governorate, to demand the release of Sheikh Tawfiq al-Amer.
Mr Amer was arrested after calling for a "constitutional monarchy" in the Sunni-dominated kingdom, according to the Rasid website, which specialises in Shiite Saudi news.
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More News On Unrest In Saudi Arabia
Middle East unrest: All quiet in Saudi Arabia? -- BBC
Fear of Domestic Unrest in Saudi Arabia -- Bulawayo24
Saudi Arabia: Shia arrest spooks stocks -- Financial Times
Shi'ites stage small protest in Saudi oil province -- Reuters
Online Calls Increase For Protests In Saudi Arabia -- NPR (Audio)
Oil shakes starting to unsettle Saudi Arabia -- Sydney Morning Herald
Saudi outflows are worrying omen in Mideast crisis -- Reuters
Saudi Arabia's Musk Revolution -- Simon Henderson, Foreign Policy
The royal house is rattled too: Can the richest of all the Arab royal families stem the tide of reform? -- The Economist
Saudi Arabia Must Keep Pumping Oil to Buy Stability -- Peter Coy, Bloomberg Businessweek
ANALYSIS-Saudi needs bolder steps to avoid protest contagion -- Reuters
If Saudis revolt, the world's in trouble -- Jeremy Warner, Daily Telegraph/Vancouver Sun/