President Obama condemns violent clashes in Egypt

Egyptian police have clashed with thousands of protesters demanding the resignation of President Hosni Mubarak in Cairo for a fourth consecutive day.

Protesters gathered after Friday prayers. Police used tear gas and water cannon to disperse the crowds, who responded by throwing stones.

President Barack Obama described the protests as the result of "pent-up frustrations", saying he had frequently pressed Mr Mubarak to enact reforms. He urged both sides not to resort to violence.

The BBC's James Robbins reports.