Protesters in Tahrir Square, Cairo
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Angry crowds in Cairo refuse to leave Tahrir Square

Thousands of Egyptians remain in Cairo's Tahrir Square for an 18th day of protests.

Angry crowds continued to demand the resignation of President Hosni Mubarak a day after his televised address in which he said he would remain president until the country's September elections.

John Simpson reports from Tahrir Square in Cairo.