CAIRO  - Egyptian protesters set fire to Muslim Brotherhood offices on Friday, state television reported, as rival rallies were held nationwide a day after President Mohamed Mursi assumed sweeping powers.The offices of the Freedom and Justice Party (FJP), the Muslim Brotherhood’s political arm, were torched in the canal cities of Ismailiya and Port Said, the broadcaster said.It earlier reported that the Suez office was also set ablaze, but it later withdrew the report.Witnesses said Muslim Brotherhood supporters fired shots in the air to disperse the protesters in Port Said.A branch office of the Islamist party was set on fire in Alexandria and protesters were heading to the group’s main office in the Mediterranean city’s Sidi Gaber neighbourhood, security officials said.Police also fired tear gas at protesters trying to storm another FJP office in Alexandria, a police official told AFP.“The situation in Alexandria is tense and security forces are eager to exercise self-restraint and maintain security and protect vital establishments,” General Abdelmawgud Lutfi, head of Alexandria security, said in a statement.Earlier an FJP official told AFP the party’s office was stormed in Alexandria, where clashes broke out between rival demonstrators.Hundreds also took to the streets of the Red Sea resort city of Sharm el-Sheikh against Morsi’s declaration, chanting: “No to merging the revolution with authoritarianism.”On Thursday, Mursi assumed temporary sweeping powers that supporters say will cut back a turbulent and seemingly endless transition to democracy, but outraged critics who say he has now become a dictator.President Mursi insisted Egypt was on the path to “freedom and democracy”. “Political stability, social stability and economic stability are what I want and that is what I am working for,” he told a rally outside the presidential palace. “I have always been, and still am, and will always be, God willing, with the pulse of the people, what the people want, with clear legitimacy,” he said from a podium before thousands of supporters.Meanwhile, thousands of ecstatic supporters of President Mursi gathered outside the presidential palace to defend their leader against accusations from rival protesters that he has become a dictator.“We love you Mursi” chanted his supporters as protesters in Tahrir slammed “Mursi the dicator”, highlighting how polarised post-Mubarak Egypt has become. “Mursi took the decisions we wanted, he is not a dictator at all,” said jewellery store owner Mostafa Ammar, 37, dressed in a white robe above the ankle, in prophetic tradition.“Mursi is on the right track and aims to achieve the goals of the revolution,” that toppled Hosni Mubarak last year, said Abu Bakr Abdelkader, 34.The president’s decisions “are definitely revolutionary and come from his revolutionary legitimacy,” said teacher Mostafa Shehata, 29.“The problem is that many don’t like to have a Muslim Brotherhood president,” he said.Some waved Egyptian flags, others held up the green flags of the Muslim Brotherhood, on whose ticket Mursi won the elections in June.The Islamist president assumed his sweeping new powers in a decree read out by his spokesman Yasser Ali on state television on Thursday. “The president can issue any decision or measure to protect the revolution,” it said.“The constitutional declarations, decisions and laws issued by the president are final and not subject to appeal.”Mursi also sacked prosecutor general Abdel Meguid Mahmud, whom he failed to oust last month, amid strong misgivings among the president’s supporters about the failure to secure convictions of more members of the old regime.“The president sacked the corrupt general prosecutor who mixed politics and law, so why are others angry?” asked Mohammed Shaaban, a 25-year-old medical student.On the other side of Cairo, thousands packed Tahrir Square, furious that whatever gains had been made after the revolution that toppled Mubarak have been snatched away in one move his successor.“It is simply not possible that the revolution happened two years ago, and we moved forward and moved forward, only to have a new dictatorship again,” said Nagla Samir.“We took to the streets for freedom,” she said.Morsi’s opponents were led by leading dissidents former IAEA chief Mohamed ElBaradei and Amr Mussa, a former foreign minister and Arab League chief.With the new decisions, “Mohamed Morsi is saying ‘I’m God and my decisions are above everything else’,” said Ahmed al-Awady in Tahrir.On the outskirts of the Tahrir, clashes continued into a fifth day between police and protesters demanding justice for those killed during the 2011 uprising.