Update 12:08 p.m. ET: U.S. officials tell NBC News that Mubarak's speech surprised people even his own government.

"He called an audible on them" an official told NBC's Robert Windrem.

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U.S. officials tell NBC News' Robert Windrem that Egyptian military officials turned on President Hosni Mubarak last night, with some senior military officials threatening to take off their uniforms and join the protesters.

Asked if this was a military coup, an official said, "Call it clear military pressure."