The debate over "free speech" versus "hate speech" has taken a new twist in San Francisco. City leaders are denouncing a new round of Muni bus ads they say are anti-Muslim and contain powerful images and inflammatory language.

The ads will run for one month and are placed on 10 out of the Muni system's 800 buses. The sponsor paid $5,000, which Muni says will go to fund a study on the impact of discrimination in the Muslim community.

The ad shows Osama bin Laden and the burning twin towers. The tag line says, "That's his jihad, what's yours?" The campaign is the latest from the American Freedom Defense Initiative, which says it is educating America about what it calls the "greatest danger facing this country."

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