The police and military officials say Monday's attack began with the detonation of roadside bombs that destroyed and set ablaze four armored vehicles and a fifth one carrying signal jamming equipment.
It did not provide any casualty figures, but the attack appears to have been the deadliest on security forces in Sinai since July, when at least 23 soldiers were killed in a suicide vehicle bombing that targeted a checkpoint near the Gaza border.
Reportedly five police officers were killed and six injured in a ferocious terrorist attack on a police convoy in the north of Egypt's Sinai Peninsula, local media reported Monday; other sources put the death toll as high as 18.
As a result, the raid's forces opened fire on the militants.
Two police lieutenants were among the dead.
Since then, hundreds of Egyptian security personnel have been killed in attacks across Sinai - especially in the peninsula's volatile northeastern quadrant, which shares borders with both Israel and the Hamas-run Gaza Strip.
5.6-magnitude quake detected in North Korea
The North has repeatedly claimed that it has a thermonuclear weapon, which can be far more powerful than other nuclear devices. In January 2016, North Korea conducted its fourth nuclear test, which Pyongyang claimed to be a test of a hydrogen bomb.
IS claimed it was behind the attack via its news agency Amaq.
The attack took place about 30 kilometers (nearly 19 miles) west of el-Arish in northern Sinai, the epicenter of a long-running insurgency now led by an IS affiliate.
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.
Five policemen, including three officers, were also injured in the shootout, he said. According to the military, thousands of militants have been killed in the operations held against them.
Egypt accuses Hasm of being a militant wing of the Muslim Brotherhood, an Islamist group it outlawed in 2013.
The ambush came a day after authorities said they had caught a cell planning attacks in the capital, Cairo.