'Bullets pinging off the buildings'
Thousands of supporters of the ousted Egyptian President Mohammed Morsi have started fresh protests in the capital, Cairo, amid fears of further clashes.
Security forces are reported to have blocked off the focal point of their demonstrations, central Ramses Square.
The protests are taking place two days after Muslim Brotherhood camps were broken up, leaving at least 638 dead.
The BBC's Middle East Editor Jeremy Bowen reports from Cairo where he witnessed live gunfire.
- From the section Middle East