The residents planned to hold protests to demand the release of political prisoners and show solidarity with the people of Bahrain, the witness went on to say.
Thousands of people have said they are prepared to attend the protests after Saudi youths named March 11th the Day of Rage on social networking website facebook.
On Wednesday, Saudi King Abdullah suddenly announced a series of benefits for his citizens following revolutions in Tunisia and Egypt.
King Abdullah introduced a package of social and economic overhaul amounting to USD 10.7 billion.
He also granted pardon to some prisoners indicted in financial crimes and ordered the implementation of a 15-percent pay hike for state employees as well as an increase in the cash available for Saudi housing loans.
Analysts believe the huge hike in benefits introduced by the Saudi King is actually intended to avert an uprising in the country.
In Egypt, pro-democracy demonstrations ousted President Hosni Mubarak on February 11 following his decades-long grip on power and rallies in Tunisia toppled President Zine El Abidine Ben Ali.
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