“The square is absolutely packed, there is hardly standing room for people. Tens of thousands of people are still streaming towards the square,” she said.

Our producer in Egypt reports on the latest developments

“The mood and atmosphere is incredible.”

Our correspondent said the army was “facilitating” the protests.

Soldiers at Tahrir Square have formed a human chain around protesters, and are checking people as they enter for weapons. Tanks have been positioned near the square, and officers have been checking identity papers.