‘Departure Day’ protests in Egypt

Tens of thousands of Egyptians have been taking part in a "day of departure" to try to oust President Hosni Mubarak. There is an increased army presence in Cairo's Tahrir Square after unrest that has led to hundreds of casualties. After Friday prayers were held in a relaxed atmosphere, the crowd started chanting for Mubarak to go. The World's Matthew Bell is in Cairo.  The Egypt protests on The World