Islamic State militants ambushed a police convoy in Egypt's Sinai Peninsula on Monday, killing 18 policemen and wounding seven others in one of the deadliest attacks this year in the restive region bordering Israel and the Gaza Strip.
Police and military officials said roadside bombs destroyed and set ablaze four armored vehicles and a fifth carrying signal-jamming equipment. The gunmen later opened fire with machine guns and commandeered a police pickup truck.
Among those killed were two police lieutenants. The wounded included a police brigadier general. The officials spoke on condition of anonymity because they were not authorized to brief media.
The Islamic State group claimed responsibility for the attack on its Aamaq news agency.
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. The Interior Ministry, which oversees the police, issued a statement confirming the incident, but its account of the incident provided no details on casualty figures or how many vehicles were destroyed.
It said police traveling in the convoy fired at a car that rushed toward them, causing it to blow up and damage several of the convoy's vehicles. That was followed by an exchange of gunfire with "terrorist elements" hiding in the desert on both sides of the road.
"That led to the martyrdom and wounding of some of the convoy's personnel," it cryptically added.
"Reinforcements were swiftly sent and a security ring was erected around the site while combing operations were underway," it said.
Monday's attack was the deadliest against security forces since July, when IS militants attacked a remote army outpost in the border town of Rafah, killing 23 soldiers. That was the deadliest attack in two years.
In March, the military said militants killed 10 soldiers during an army raid in Sinai's central region.
Egypt has battled militants in Sinai for years, but the insurgency became far more deadly after the 2013 military ouster of Mohammed Morsi, an elected Islamist president. It has since waged a number of high-profile attacks on the mainland, including areas near Egypt's porous and desert border with Libya. Egypt maintains that militants attacking its security forces and minority Christians sneak into the country across the border with Libya carrying weapons.
In recent years there has also been a wave of attacks, mainly targeting security forces, blamed on splinter factions of Morsi's Muslim Brotherhood group.