Saudi policemen at a check point in Riyadh, Saudi Arabia, Friday, March 11, 2011.

A bus transporting workers to and from Saudi Arabia’s eastern Al-Qatif province was assaulted by armed rioters, Saudi police said Tuesday.

The armed attackers stopped the vehicle at gunpoint and fired at it, a police media spokesman said in a statement quoted by the Saudi Press Agency.

But security authorities were able to stop the attack, preventing any of the workers on the bus from being injured, the SPA statement added.

Local authorities have launched an investigation into the incident, it added.

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