Islamic State claimed responsibility for the attack in a statement posted by its news agency Amaq.
Four armoured vehicles were destroyed due to roadside bombs and a fifth one carrying signal jamming equipment.
At least 23 Egyptian soldiers were killed when suicide vehicle bombs tore through two military checkpoints in North Sinai in July, in one of the bloodiest assaults on security forces in years.
Suspected militants Monday ambushed a police convoy in Egypt's Sinai Peninsula, killing 18 policemen and wounding several others, including a police brigadier-general, according to security and military officials. Following the explosion, the perpetrators opened fire on police officers.
Egypt's security forces killed 10 suspected militants on Sunday in a shootout during a raid on two apartments in central Cairo, the interior ministry said.
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At least 26 Egyptian soldiers were killed or wounded on July 7, 2017, in attacks on checkpoints in the Sinai Peninsula.
The officials spoke on condition of anonymity because they were not authorised to speak to the media. That was the deadliest attacks in two years.
The exchange of gunfire took place in the densely populated Cairo district of Ard el-Liwa and wounded five policemen, including two officers, said the officials.
They said initial enquiries indicate the militants were planning to attack state institutions, the police, the military and the judiciary, and to blow up key installations. Police said the militants had sneaked into Cairo from the volatile northern Sinai.
Since 2013 following the overthrow of the Muslim Brotherhood, Egypt's army and security forces have increasingly engaged in violent confrontations in North Sinai with Islamist insurgents.
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