Saudi Arabia Braces for ‘Day of Rage’ Rally
Security is tight in the capital, Riyadh, where police have boosted their presence.
The demonstrators are expected to call for greater political freedoms in the conservative kingdom.
Witnesses say up to four people were wounded in the shooting.
The United States said it was closely monitoring the situation and reiterated its support for the right to peaceful assembly.
In February, Saudi King Abdullah announced a number of reforms, in an apparent effort to appease citizens in the wake of anti-government protests elsewhere in the Middle East.
The incentives included pay raises, increased spending on social programs and interest-free loans.