Gunmen have killed two Egyptian soldiers in an attack on a military facility near the Suez Canal city of Ismailiyah, a security official said.
A third soldier was wounded in Sunday's attack on the base, located on the road between Ismailiyah and the city of Zagazig, to the west in the Nile Delta.
The gunmen opened fire from a passing vehicle, the official, speaking to the Reuters news agency on condition of anonymity, said.
Attacks on the security forces have become commonplace since President Mohamed Morsi was removed from power by the army on July 3 following mass protests against his rule.
His downfall set off an armed campaign against the state by fighters in the Sinai Peninsula with links to al-Qaeda.
Gunmen have also struck in towns and cities to the west of Sinai in the Suez Canal area and the Nile Valley.
The interim government installed by the army says it is fighting a war on terrorism, with the army launching a campaign to re-establish control of the Sinai.
After Morsi's downfall, the security forces killed hundreds of supporters of his Muslim Brotherhood and arrested some 2,000 more.
The Brotherhood says it is committed to peaceful resistance, while the state has described it in terms akin to al-Qaeda.