Supporters of the banned Islamist Muslim Brotherhood in Egypt have set fire to two university buildings in Cairo, state TV says. Students fought police at Al Azhar University, reportedly setting fire to the business faculty after trying to prevent students from sitting exams. A fire was reportedly also set in the agriculture faculty building. Three people died on Friday as police fought Brotherhood supporters in Cairo, southern Minya and the Nile Delta. Authorities have cracked down on the Brotherhood since July, when Islamist President Mohammed Morsi, who belongs to the group, was deposed by the army. The Brotherhood, which had been banned since September from all activity, was declared a terrorist group on Wednesday following a suicide bombing of a police headquarters in Nile Delta.