"It could embroil the United States in a significant, lengthy, and uncertain military commitment, " he said.

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To complicate matters further, this conflict could embroil other East African nations, including Kenya, Sudan, and Uganda.

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The BBC's Washington correspondent Nick Bryant says it is a scandal which threatens to embroil the White House.

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But a bigger probe currently unfolding about insider trading on Wall Street could embroil some big hedge funds.

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