State news agency MENA quoted a high ranking ministry official confirming the attack and casualty figures.
Three police vehicles had been driving along the road linking the Sinai city of Bir al-Abd to the northern city of Al-Arish when they struck a series of improvised explosive devices, local media quoted unnamed security sources as saying.
At least 18 police forces, including a general, have been killed in Egypt's Sinai Peninsula after militants ambushed their convoy, in one of the deadliest terrorist attacks in the restive region since January.
The assailants, whose identities were not yet known, later opened fire at survivors and commandeered a police pickup truck.
Hundreds of police and army personnel have been killed since then.
At least 26 Egyptian soldiers were killed or wounded on July 7, 2017, in attacks on checkpoints in the Sinai Peninsula.
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Curfew continues on the main road leading to Dera headquarters and no unauthorized person is allowed to enter the campus. Sirsa :Security forces left for Dera Sacha Sauda outside Sirsa this morning for search and sanitation operations.
The attack took place about 30km west of el-Arish in northern Sinai, the epicenter of a long-running insurgency by militants now led by the extremist Islamic State group.
In December 2016, Egypt's President Abdel Fattah al-Sisi named the 22-year-old Mahmoud Shafiq as the suicide bomber who attacked a church attached to Egypt's main Coptic Church in Cairo, killing more than 25 people.
The security forces targeted members of the IS affiliated group Sinai Province who were based in the Ard El Lewaa suburb where they lived as "ordinary citizens", according to the ministry statement.
The ambush came a day after authorities said they had caught a cell planning attacks in the capital, Cairo. Three officers were among the policemen killed, and a brigadier lost a leg.
Egypt accuses Hasm of being a militant wing of the Muslim Brotherhood, an Islamist group it outlawed in 2013.