Fox News apologized four times on-air Saturday for a factual error made last week by guest and "terrorism analyst" Steven Emerson, who claimed that many European cities have "no-go zones" where non-Muslims don't dare venture.
The claim sparked widespread outrage. Twitter users began using the sarcastic hashtag #FoxNewsFacts to make fun of the network, while United Kingdom Prime Minister David Cameron called Emerson a "complete idiot" for his assertion that Birmingham, England, is a city dominated by Muslims and that "non-Muslims just simply don't go in."
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