United States ambassador to Libya, J. Christopher Stevens
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Four people have been arrested in connection with the attack on the U.S. consulate in Benghazi that left four Americans dead, including Ambassador Chris Stevens, a top aide to Libya's prime minister said Friday.
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UPDATE: The National Weather Service says the tornado that hit Moore, Oklahoma, was a top-of-the-scale EF-5 twister with winds of at least 200 mph.