Death toll of Monday's anti-police terror attack in the city of Arish in Egypt's North Sinai province had climbed to 18, state-run Ahram newspaper reported.
The force had been en route to the town of El-Arish when an explosives-laden vehicle tried to cut it off, the Interior Ministry said in a statement.
Nine suspected terrorists have been killed in a shootout in Egypt's third largest city Giza, home to the legendary Great Pyramids and the Sphinx.
One of the security sources said authorities suspect the individuals to be members of Hasm, a group which has claimed several attacks around the Egyptian capital targeting judges and policemen since a year ago.
"That led to the martyrdom and wounding of some of the convoy's personnel", it cryptically added.
At least 10 suspected militants were killed in the raids.
According to the state news agency MENA, security forces entered a gun battle with militants in the vicinity of the blast site and managed to slay several of them.
The attack illustrates how hard it is for the government to crush a militant campaign that has withstood a four-year crackdown.
The Sinai Peninsula has remained the epicenter of a deadly militant insurgency since 2013, when Mohamed Morsi, Egypt's first freely-elected president, was ousted and imprisoned in a bloody military coup. It has since waged a number of high-profile attacks on the mainland, including areas near Egypt's porous desert border with Libya.
Police said they killed 10 militants in two simultaneous raids on apartments in a densely populated Cairo neighborhood. They said the fighters had sneaked into the capital from northern Sinai but did not say whether they were members of ISIL.