(NBC NEWS) CAIRO — An adviser to Egyptian President Mohammed Morsi said Wednesday that a military coup was underway, that tanks were on the move outside Cairo and that communication with the president had been cut off.

As a military deadline came and went for Morsi to step aside, the army took control of state television, and boisterous crowds opposed to the regime cheered and danced in Tahrir Square.

Representatives of the Muslim Brotherhood, which supports Morsi, also said that some of its leaders had been rounded up and arrested.

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