Supporters and opponents of deposed Egyptian president Mohammad Mursi on Saturday called for rival demonstrations on the 1973 Arab-Israeli war anniversary after the deadliest violence in weeks.

Supporters and opponents of deposed Egyptian president Mohammad Mursi on Saturday called for rival demonstrations on the 1973 Arab-Israeli war anniversary after the deadliest violence in weeks.

The Anti-Coup Alliance called on its supporters to try to reach Cairo's Tahrir Square, blocked off by the army, to mark Sunday's 40th anniversary of the war.

The conflict, known as the October war in the Arab world, is remembered proudly by the Egyptian army as it caught the Zionist entity defenses unawares and led ultimately to Egypt's recovery of the Sinai Peninsula.

"The Egypt Anti-Coup Alliance repeats its call to all Egyptians to continue their protests in every part of Egypt, and to gather in Tahrir Square on Sunday, October 6, to celebrate the army of that victory and its leaders," the bloc said.

Attempts on Friday by Muslim Brotherhood protesters against the army's July 3 overthrow of Mursi to reach Tahrir Square sparked clashes with security forces who responded with tear gas and warning shots.

Four people were killed in Cairo's deadliest protest violence in more than a month as demonstrators clashed with coup supporters as well as security forces.

It was unclear whether the political affiliation of the dead. A senior medical official said only that none of them were security personnel.

Clashes were also reported Friday in Alexandria and the Upper Egypt province of Assiut.

Calls for demonstrations on Sunday were also made by Tamarod, the movement which led nationwide protests against Mursi that finally led to his ouster by the army.

"We call all Egyptians to come out tomorrow across all squares in the country to assert that this nation will not allow its revolution to be stolen," prominent Tamarod leader Mahmoud Badr told reporters.