Militants in Egypt launched three attacks on Monday, a day after dozens were killed in clashes between security forces and supporters of ousted President Mohammed Morsi.

Two people were killed and around 50 injured when a car bomb exploded outside a security building in Egypt's Sinai peninsula, security and medical officials said.

At least 38 people were killed in clashes between Islamists and police in Egypt on Sunday, as thousands of the military's supporters marked the anniversary of the 1973 Arab-Israeli war.

Loyalists of deposed Islamist president Mohammed Morsi, overthrown in a July military coup, tried to converge on a central Cairo square for the anniversary celebrations, when police confronted them.

Egyptian authorities have released two Canadians who had been held without charge in a crowded, cockroach-infested prison cell in Cairo since mid-August, Canadian officials said Sunday.

Prime Minister Stephen Harper welcomed the release of John Greyson, a Toronto filmmaker and university professor, and Tarek Loubani, an emergency room doctor from London, Ontario.

Egyptian police used tear gas Saturday to prevent Islamist students from entering a Cairo square that was site of a deadly security crackdown in August, a security official said.

Groups of students tried to enter Rabaa al-Adawiya Square in the Nasr City district when they were stopped by police who fired tear gas to disperse them, the official said.

Egypt on Sunday braced for rival demonstrations called by supporters and opponents of deposed Islamist President Mohammed Morsi as it marks the 40th anniversary of the 1973 Arab-Israeli war.

The interior ministry warned it would "firmly confront" any violence at the demonstrations on Sunday, which aimed to converge at Cairo's Tahrir Square, epicenter of the 2011 uprising against Hosni Mubarak.

An Egyptian military court Saturday handed a journalist a six-month suspended jail term for reporting without authorization in a military zone of the Sinai , his lawyer and an army source said.

Ahmed Abu Derra was acquitted of two other charges -- of spreading "lies" through his reports on the army's campaign against Islamist militants in the Sinai Peninsula and of taking pictures of waterways in the Suez Canal, said one of his lawyers, Mohammed Hanafi.

Islamist supporters of deposed Egyptian president Mohammed Morsi challenged the military Saturday with a call for new protests on the 1973 Arab-Israeli war anniversary after the deadliest violence in weeks.

The Anti-Coup alliance of Islamist groups called on its supporters to try once more to reach Cairo's Tahrir (Victory) Square, blocked off by the army, to mark Sunday's 40th anniversary of the war.

Four people were killed Friday when Islamist supporters of ousted Egyptian president Mohammed Morsi clashed with opponents across Cairo as police fired tear gas and live rounds into the air.

Khaled al-Khatib, head of Egypt's emergency services, said 40 others were wounded in the fighting that broke out after the main weekly prayers in the capital and other parts of the country.

France on Friday offered some 60 Syrians the right to seek asylum after the refugees occupied a key point in the Channel port of Calais in a desperate bid to get to Britain.

The refugees, 20 of whom are on a hunger strike, have since Wednesday occupied the footbridge of a ferry terminal at Calais port -- from where ships leave for Britain -- to press London to accept them.

Masked gunmen fired on a military vehicle near the Egyptian city of Ismailiya on Friday, killing one soldier and wounding an officer and another soldier, a security official said.

The attack took place on the desert road between Cairo and Ismailiya when the assailants in a car without number plates opened fire on the military vehicle, said the official.