Gunmen killed three Egyptian soldiers in an attack on a bus, prompting a warning from the army that it would eliminate the Muslim Brotherhood.Al Qaeda-inspired Islamist militant groups in Sinai have stepped up attacks on security forces since the army toppled President Mohamed Mursi in July after mass protests against his rule.Some 49 people were killed yesterday in anti-government protests which were attacked by supporters of the new political order and security forces, witnesses said.Yesterday was the third anniversary of the uprising that toppled autocrat Hosni Mubarak. Security forces said they fired live rounds on Brotherhood supporters as they tried to set up a sit-in in Cairo.Security sources said that 23 people died in the incident, 22 from by bullet wounds, and that they were included in the official death toll of 49.The violence showed deep divisions that have flared often since the 2011 revolt that raised hopes of a stable democracy. The military blames the Brotherhood for much of Egypt's political violence.In another attack in lawless Sinai, five soldiers were killed yesterday when an army helicopter crashed in the north of the peninsula in an operation against militants.It was a missile attack, security sources said, without giving further details. The army has not commented on the cause of the crash.Militant group Ansar Bayt al-Maqdis (Supporters of Jerusalem) claimed responsibility for a rocket attack on an army helicopter in a statement posted on the internet.The group also said it was behind a wave of bomb attacks in Cairo on Friday which killed at least six people.Egyptian authorities make no distinction between militants operating in the Sinai and the Brotherhood, which renounced violence in the 1970s but has been declared a terrorist group by the Egyptian government.In a statement on Facebook, the army said: ‘We assure the Egyptian people of the great determination of its men to fight black terrorism and the complete elimination of the advocates of oppression and sedition and blasphemy from followers of the Muslim Brotherhood.’The soldiers who were killed in the bus attack were on their way back from holiday when gunmen opened fire with automatic weapons and rocket-propelled grenades, security sources said.Security forces have killed up to 1,000 Muslim Brotherhood supporters and put the movement's top leaders in jail.But the tough measures have failed to pacify Egypt, which is of great strategic importance because of its peace treaty with Israel and control over the Suez Canal.Interim President Adly Mansour announced today that Egypt's presidential elections would be held before parliamentary polls.The new political timetable could see army chief General Abdel Fattah al-Sisi, who toppled Egypt's first democratically-elected president, become head of state within months.Parliamentary elections were supposed to happen first under the roadmap agreed after the army deposed Mr Mursi.But critics argued that a presidential poll should be held first to elect a strong leader able to stabilise Egypt before potentially divisive parliamentary elections.General Sisi, who was President Mubarak's head of military intelligence, is expected to announce his candidacy for the presidency soon and is likely to win by a landslide.His supporters view him as a decisive figure who can pacify Egypt. The Brotherhood accuses him of masterminding a coup and holds him responsible for what it says are human rights abuses.(dailymail.co.uk)ANN.Az