According to the spokesman, eight soldiers were killed and 15 others injured when some of the attackers detonated their explosive vests.
Eight Egyptian soldiers and 14 militants were killed in fighting in central Sinai on Saturday when gunmen carrying explosive belts and grenades targeted a military checkpoint, the army said.
It did not disclose where and how the nine other militants were killed.
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The security forces have arrested suspects and demolished houses that belong to terrorists, including those facilitating tunnels leading to the Gaza Strip.
Egypt extended its nationwide state of emergency for three months as of April 14, according to the official gazette.
The decree said the armed forces and police should take all necessary measures "to confront the threats and funding of terrorism and maintain security throughout the country".
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Most of the terror attacks were carried out by a Sinai-based group affiliated with the Islamic State (IS) regional terrorist group. It was extended in July and again in October then January.
Security forces have sought to quell attacks by an Egyptian extremist group that later declared allegiance to ISIS since 2013.
Egypt faces a Daesh insurgency in the remote North Sinai region that has killed hundreds of soldiers and policemen in recent years and has expanded to include attacks on civilians.
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The attack was the largest against Egyptian security forces since President Abdel Fattah al-Sisi won a second term in office last month, promising to work for stability and security in Egypt.