Updated

Several hundred supporters and opponents of Egypt's President Mohammed Morsi are clashing near Cairo's Tahrir Square amid a rally calling on Morsi to "cleanse the judiciary."

The Friday rally had been held by supporters of Morsi outside the Cairo High Court. Anti-Morsi protesters appeared down the street from the rally.

It is not clear who started the violence, but the two sides threw rocks at each other, and a bus was seen set on fire. The sound of birdshots cracked through the air in the clashes, which were shown on TV. There were no police in sight.

Supporters of Morsi call on him to take measures to purge the judiciary of former regime supporters. Many opponents of the call view it as an attempt by Islamists to control the judiciary.