Gunmen killed five Egyptian soldiers Monday when they opened fire on an army patrol near the Suez Canal city of Ismailiya, security officials said.
Another soldier was hospitalized in serious condition, the officials said.
No one immediately claimed responsibility for the attack, dpa reported.
In the restive Sinai Peninsula, two people were also killed in an explosion near South Sinai province's security headquarters in the city of al-Tor, the state-run newspaper Al-Ahram reported.
No further details were immediately available.
Security forces have come under attack west of the Suez Canal, and Islamist extremist groups have intensified their activity in the Sinai Peninsula to its east since the military's ouster of democratically elected Islamist president Mohammed Morsi in July.
The latest attacks came a day after 53 people were killed as security forces and civilian supporters dispersed marches by Morsi loyalists in Cairo and other cities.
More than 400 people were also reported to have been arrested in the clashes while tens of thousands of supporters of the military-backed interim government celebrated the 40th anniversary of the 1973 Arab-Israeli war in Tahrir Square.
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