Egyptian security forces killed 10 militants in an exchange of fire and arrested 400 suspects, including foreigners, in a continuing crackdown in Sinai, the army said in a statement carried by state TV.
Based on army statements, around 38 militants have been killed since the latest offensive to crush insurgents blamed for a string of attacks began.
Egypt launched a major security operation on Friday involving the army and police against “terrorist and criminal elements and organisations” across the country, according to the army spokesman.
President Abdel Fattah al-Sisi, seeking re-election in March, in November ordered the armed forces to defeat militants within three months after an attack on a mosque killed more than 300 people.
The insurgency poses the greatest challenge to the government in a country both the most populous in the Arab World and a major regional ally of the United States.
Sisi was elected for his first term in 2014 after the army ousted Islamist President Mohamed Mursi following mass protests against his rule.