Thousands of protesters have again defied a military curfew and filled cities across Egypt for a sixth day of protest against the rule of President Hosni Mubarak.
The 82-year-old is clinging on to power despite unprecedented demands for an end to his 30-year rule.
US Secretary of State Hillary Clinton has called for an "orderly transition" of power through free and fair elections in the Arab world's most populous nation.
As many as 10,000 people have been protesting in Cairo's Tahrir Square, a rallying point to express anger at poverty, repression, unemployment and corruption.
They have been joined by opposition leader and Nobel peace laureate Mohamed ElBaradei.
In a show of strength by the regime warplanes and helicopters have been flying overhead, while a column of tanks arrived there only to have its path blocked by protesters.