Egypt unrest: Barack Obama urges power transition now
US President Barack Obama has said an orderly political transition "must begin now" in Egypt and lead to free and fair elections.
His statement followed the announcement by Egypt's President Hosni Mubarak that he would not stand for re-election.
Earlier, the US had told Mr Mubarak not to stand for re-election nor to put forward his son, the BBC learned.
The Obama adminstration's message was carried to Cairo on Monday by former US Ambassador to Egypt Frank Wisner.
The White House had previously said it was not Mr Obama's place to pick Egypt's leader.
On Tuesday night, Mr Mubarak - who has ruled Egypt for the past three decades - said he would not stand for re-election.
However, he said nothing about his son, Gamal Mubarak, whom he is seen as having positioned to be his successor.
Mr Obama's televised statement followed discussions with his national security advisers in Washington on Tuesday.
While he did not say Mr Mubarak should stand down immediately, he said "an orderly transition must be meaningful, it must be peaceful and it must begin now".
Mr Obama said he had spoken to the Egyptian leader after his announcement in Cairo and that Mr Mubarak recognised "that the status quo is not sustainable and a change must take place".
The US president praised Egypt's military "for the professionalism and patriotism that it has shown thus far in allowing peaceful protests while protecting the Egyptian people" and urged it to continue that approach.
He stressed that it was up to the Egyptian people to choose their leaders, and that the US would continue to offer support and friendship to them.
BBC state department correspondent Kim Ghattas, in Washington, says the US hopes Mr Mubarak has figured out on his own that he has got to go now, rather than stand down after the presidential election in September.
Washington has sought to make it clear that it understands the grievances of the Egyptian people, while also making clear it wants them to be able to pick their next leader, our correspondent says.
Earlier on Tuesday, US Senator John Kerry, a top Washington foreign policy voice, urged Mr Mubarak to pledge that neither he nor his son would stand in the presidential election.
Writing in the New York Times, Mr Kerry said Mr Mubarak had to accept Egypt's stability "hinges on his willingness to step aside gracefully".
Responding after Mr Mubarak's statement on Tuesday evening, he said: "I believe that President Mubarak should now work with the military and civil society to establish an interim caretaker government.
"It remains to be seen whether this is enough to satisfy the demands of the Egyptian people for change."
Mr Kerry said the Egyptian people had made clear that they wanted a future offering greater democracy and greater economic opportunity.
"Now, that future belongs to them to shape. The Egyptian people are writing the next chapter of Egyptian history," he said.
The US state department on Tuesday ordered the departure of all non-emergency US government personnel and their families from Egypt and said it would continue to help any US citizens wishing to leave.
About 1,600 US citizens and their family members have been evacuated since Monday, the state department said.