Al-Jazeera Video: Clashes between rival groups in Tahrir Square

"Egypt's Muslim Brotherhood party is urging its supporters to leave Tahrir Square, after fighting took place there between rival groups.
More than 100 people have been injured in clashes between protesters who back President Mohamed Morsi and those who oppose him.

It is the worst violence under the Morsi presidency.

Al Jazeera's Sherine Tadros reports from Cairo."