Amid continuing protests over the US made film, "Innocence of Muslims", ridiculing Prophet Mohammed, the US Department of Homeland Security and FBI warned Thursday that the outrage, and dangers to Americans could worsen in the coming days.

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"The risk of violence could increase both at home and abroad as the film continues to gain attention," the US agencies said in a joint intelligence bulletin.

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"Additionally, we judge that violent extremist groups in the United States could exploit anger over the film to advance their recruitment efforts."

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Posted in July on YouTube, it got more notice recently after Egyptian television aired segments and anti-Islam activists promoted it online.

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