Egypt: What will happen after Mubarak leaves power?
4 February 2011 Last updated at 23:04 GMT
As the stand-off continues in Cairo, the diplomatic pressure on President Mubarak shows no sign of letting up.
US President Barack Obama has repeated his call for an orderly transition of power and said the country could not return to its old ways.
The BBC's world affairs editor, John Simpson looks at the forces at play behind the scenes.