CAIRO - Youths fought Egyptian police in Cairo and Alexandria on Friday on the second anniversary of the revolt that toppled Hosni Mubarak and brought the election of an Islamist president who protesters accuse of riding roughshod over the new democracy. The January 25 anniversary showcased the divide between the Islamists and their secular foes that is hindering President Mohamed Mursi's efforts to revive an economy in crisis and reverse a plunge in Egypt's currency by enticing back investors and tourists. Inspired by Tunisia's historic popular uprising, Egypt's revolution spurred further revolts across the Arab world. But the sense of common purpose that united Egyptians two years ago has given way to internal strife that has only worsened and last month triggered lethal street battles. Opponents of Mursi and his Muslim Brotherhood allies massed in Cairo's Tahrir Square to revive the demands of a revolution they say has been betrayed by Islamists. "Our revolution is continuing. We reject the domination of any party over this state. We say no to the Brotherhood state," Hamdeen Sabahy, a popular leftist leader, told Reuters TV as he made his way to the square for the rally. Police battled protesters who threw petrol bombs and firecrackers as they tried to approach a wall blocking access to government buildings near the square in the pre-dawn hours. Clouds of tear gas fired by police filled the air. At one point, riot police used one of the incendiaries thrown at them to set ablaze at least two tents erected by the youths, a Reuters witness said. Clashes between stone-throwing youths and the police continued in streets near the square into the day. Ambulances ferried away a steady stream of casualties. The health ministry said 25 people had been injured since Thursday in clashes around Tahrir Square. There were similar scenes in Alexandria, where protesters and riot police skirmished near local government offices. Tear gas fouled the air and black smoke billowed from tires set ablaze by youths. Nine people were wounded by birdshot pellets, according to medical and security sources. Some protesters pledged to march to Mursi's Cairo palace. Thousands more protested against the Brotherhood in cities across Egypt including Suez, Ismailia and Port Said. The Brotherhood decided against mobilizing in the street for the anniversary, wary of the scope for more conflict after violence in December that was stoked by Mursi's decision to fast-track an Islamist-tinged constitution. "The people want to bring down the regime," chanted crowds in Tahrir Square, where numbers stood at several thousand by early afternoon. "Save Egypt from the rule of the Supreme Guide," said another, a reference to leader of the Muslim Brotherhood, Mohamed Badie. "We are not here to celebrate but to force those in power to submit to the will of the people. Egypt now must never be like Egypt during Mubarak's rule," said Mohamed Fahmy, an activist. Mursi, in a speech on Thursday marking the Prophet Mohammad's birthday, called on Egyptians to mark the anniversary "in a civilized, peaceful way that safeguards our nation, our institutions, our lives". "The Brotherhood is very concerned about escalation, that's why they have tried to dial down their role on January 25," said Shadi Hamid, director of research at the Brookings Doha Center. "There may very well be the kinds of clashes that we've seen before, but I don't see anything major happening that is going to fundamentally change the political situation," he said. With its eye firmly on forthcoming parliamentary elections, the Brotherhood marked the anniversary with a big charity drive across the nation. It plans to deliver medical aid to 1 million people and distribute affordable basic foodstuffs. Writing in Al-Ahram, Egypt's flagship state-run daily, Brotherhood leader Badie said the country was in need of "practical, serious competition" to reform the corrupt state left by the Mubarak era.