1320 GMT: Al Jazeera is now putting out estimates of more than 2 million in Tahrir Square in Cairo. The military is putting up barbed wire around the Presidential Palace in Heliopolis.
From The Guardian's live-blog:
1.08pm: Protesters are now starting to march in Alexandria, Human Rights Watch Reports. There is no clear route for the march, so a bit of confusion.
The Harriet Sherwood, who's in Alexandria, adds:
No one is running this, apart from the people themselves
The square is packed but this march looks like it's not happening. Where are the leaders?