A group of 14 militants armed with explosive vests, machine guns and rocket-propelled grenades (RPGs) attacked a military camp in central Sinai at dawn on Saturday, military spokesman Col.
The incident led to eight casualties and 15 injuries among Egyptian forces, Army spokesperson Tamer El-Refai was quoted as saying by Al-Ahram.
The army found and destroyed a training camp, which included a shooting range, an obstacle course and an underground conference room.
More than 190 militants and at least 22 soldiers have been killed in the massive operation launched on February 9.
The attack comes as security forces continued a major offensive against militants blamed for a string of attacks across the country.More news: Dalit members 'cleanse' Ambedkar statue after tributes by Maneka, BJP leaders
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Meanwhile, the official gazette said that Egypt is to extend its nationwide state of emergency for three months from April 14.
The attacks, mainly targeting police and military, increased after ouster of Islamist ex-president Mohamed Morsi in 2013 by military following massive protests against his rule.
"The armed forces and the police will take the necessary measures to confront the dangers of terrorism and its financing and to preserve security across the country", the official gazette said in announcing the extension of the state of emergency for three months.
Egypt faces an Islamic State 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. The emergency decree was subsequently renewed in July and October 2017 and January 2018.