Mubarak out? World waits for president's speech

CAIRO — Egypt's President Hosni Mubarak is to step down tonight, two sources have told NBC News, losing his 30-year grip on power after 17 days of mass uprisings across the country.

NBC's Richard Engel reported that a high-ranking source inside the president's office said the newly appointed vice president, Omar Suleiman, would take over. This was confirmed by a second source.

State television reported that country's supreme military council had expressed its "support of the legitimate demands" of the protesters after an all-day meeting. The latest developments came on the heels of repeated warnings by members of the regime of a military crackdown or coup.

Some pro-democracy protesters reacted cautiously to the reports Mubarak was leaving, saying they would only believe them if and when he announced his departure on television.

President Barack Obama on Thursday said the United States would do all it can to support an orderly transition to democracy in Egypt.

"We are witnessing history unfold," Obama said, adding "It's a moment of transformation that's taking place because the people of Egypt are calling for change."

"We want all Egyptians to know America will continue to do every thing that we can to support an orderly and genuine transition to democracy in Egypt," Obama said