Three killed, 265 held in crackdown on Egypt's Muslim Brotherhood Terrorist organisation... A supporter of Egypt's ousted Islamist president Mohammed Morsi throws tear gas towards Egyptian security forces in Cairo, Egypt. THREE people have been killed and 265 arrested in a crackdown on demonstrations in favour of Egypt's Muslim Brotherhood, which has been declared a terrorist group. The three people were killed on Friday as Islamist protesters clashed with police and opponents in several cities, the interior ministry said. Spokesman Hany Abdel Latif accused the protesters of using firearms and petrol bombs, saying they "increased their violence" in Friday's rallies. The interior ministry said police arrested 265 "Brotherhood elements" in the clashes. Egypt's military-installed government has banned protests by Brotherhood members, who have been demanding the reinstatement of deposed president Mohamed Morsi. "Legal measures are under way against the Brotherhood elements in accordance with the cabinet's listing of the Muslim Brotherhood as a terrorist organisation," the ministry said in a statement. Leaders could be sentenced to death and supporters face up to five years in jail. Crackdown... A plainclothes police officer (L) detains one of the supporters of Egypt's ousted President Mohammed Morsi following their demonstration in Cairo. The drastic decision to blacklist the Brotherhood came a day after a suicide bombing of a police building killed 15 people, in an attack claimed by a jihadist group but officially blamed on the Brotherhood. The interior ministry overnight said a man was killed in clashes around Al-Azhar university between Islamist students and civilians who opposed them. Tensions have soared in the capital since a homemade bomb went off next to a public transport bus on Thursday, wounding five people. The Brotherhood has denounced its listing as a terrorist organisation and said it would continue to hold peaceful rallies. It has since Morsi's overthrow by the military on July held almost daily protests, despite a crackdown that has killed more than 1,000 people in clashes and imprisoned thousands of Islamists. Bomb blast... Egyptian security forces and others gather at the scene of a powerful explosion believed to be caused by a car bomb at a police headquarters building, that killed at least a dozen people, wounded more than 100, and left scores buried under the rubble, in the Nile Delta city of Mansoura, north of Cairo, on December 24.