Update at 10:42 a.m. ET:Reuters quotes a U.S. official as describing Mubarak's departure from Cairo as a "positive first step."
Update at 11:03 a.m. ET: Hossam Badrawi, who was recently appointed general secretary of the NDP, resigns saying Egypt needs new parties, Al-Jazeera reports.
Update at 11:05 a.m. ET: Egyptian President Hosni Mubarak has resigned . Vice President Omar Suleiman said in a brief televised statement. His statement in full: "Hosni Mubarak has waived the office of presidency and told the army to run the affairs of the country. "
Update at 11:08 a.m. ET: Hundreds of thousands of demonstrators erupted in jubilation in Tahrir Square as vice president Omar Suleiman announces that President Mubarak has resigned and called on the army to "run the affairs of the country."
Update at 11:15 a.m. ET: Egyptian opposition leader Mohamed ElBaradei, reacting to the resignation of President Hosni Mubarak, says: "This is the greatest day of my life. The country has been liberated."
Update at 11:22 a.m. ET MSNBC reports that President Obama was notified of Mubarak's resignation during an Oval Office meeting. He then watched the TV coverage for several minutes in an outer office.
Update at 11:27 a.m. ET: Al-Jazeera correspondent Sherine Tadros, reporting from Tahrir Square, reports that a number of demonstrators have fainted amid the jubilation and been helped out of the area.
Update at 11:32 a.m. ET: Our colleagues at The Oval report that President Obama will make a statement on the Egyptian developments at 1:30 p.m. ET.
Update at 11:34 a.m. ET: Here is the full statement that a grim-looking Vice President Omar Suleiman delivered on Egypt state TV announcing President Mubarak's resignation:
In these grave circumstances that the country is passing through, President Hosni Mubarak has decided to leave his position as president of the republic. He has mandated the Armed Forces Supreme Council to run the state. God is our protector and succor.
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