Social media sites Saturday urged demonstrations as part of an opposition effort to use the world spotlight from the race to press demands for a greater political voice. Bahrain's Shiite majority claims it faces widespread discrimination at the hands of the Western-backed Sunni monarchy.
At least 50 people have died in the unrest since February 2011. On Friday, clashes broke out during a procession by tens of thousands of protesters. Bahrain's leaders vow that Sunday's race will take place. F1 teams were scheduled for practice and qualifying runs Saturday.