CAIRO, Jan. 25 (Xinhua) -- Tens of thousands of Egyptian people flocked to iconic Tahrir Square in the capital city of Cairo, outside the presidential palace in Heliopolis and other parts of the country to stage celebrations marking the third anniversary of January 25 uprising that toppled ex-president Hosni Mubarak in 2011.
"I am here in Tahrir today to express support for the army against terrorism," Ahmed al-Essawi, a university student, told Xinhua while waving a flag of Egypt among crowds of celebrators.
"It is a difficult stage that needs solidarity of all Egyptians, " the young man continued, pinning hope on military chief and Defense Minister Abdel-Fattah al-Sisi to put the country back on the right track.
Meanwhile, at least seven people were killed and 47 others were injured on Saturday during clashes between security forces and supporters of ousted Islamist president Mohamed Morsi as well as anti-government protesters across Egypt, the Health Ministry said in a statement.
"Three people were killed in Cairo, two in Giza and two in Menia," the statement pointed out, noting the injured people are from several governorates including Cairo, Giza, Alexandria, Fayoum, Ismailia, Menia and Beni Sweif.
The police fired tear gas and birdshots to disperse several pro- Morsi marches led by the Muslim Brotherhood, currently banned by the interim government as a "terrorist organization." Many Brotherhood supporters were injured and dozens of them were arrested.
On the other hand, two blasts hit the country's capital city and the Suez province on Saturday but no casualties were reported.
The first explosion targeted a police institute in Cairo's Ain Shams district, wounding one person with no deaths.
The second took place when a car bomb exploded near a police building in Suez, after which security personnel chased militants who used machine guns and RPG to attack the police camp while hiding on the roof of a nearby school.
In the Sinai Peninsula, a military helicopter crashed on Saturday while the reasons are still unknown.
"Search for the crew is underway," the military spokesman, Colonel Ahmed Mohamed Ali, said in a statement, adding that the crash took place at Al-Kharrouba area in North Sinai and the authorities are currently investigating the reasons.
However, official Al-Ahram news website said that the helicopter crashed due to "technical problems" at Al-Shallaq area in North Sinai's Sheikh Zuweid city. "The helicopter had a technical problem which led the pilot parachute for his live," Al- Ahram report said, quoting eyewitnesses.
On Friday, a string of explosions targeting police premises rocked Cairo killing six people and wounding about 100 others, while nearly 15 people were killed in clashes between security forces and pro-Morsi protesters nationwide.
Ansar Beit al-Maqdis, a Sinai-based al-Qaida-inspired group, claimed responsibility for all the bombing attacks targeting the police since Friday, the group said in a statement Saturday.
The group had claimed responsibility for an earlier blast at a security department in Daqahliya province north of Cairo last December, which left 17 dead and more than 130 injured.
Since Morsi's ouster by the military last July, his supporters have been holding protests denouncing his removal as "a coup" and calling for his reinstatement.