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.
Egyptian officials say Monday's ambush left 18 police dead and seven wounded.
As a result, the raid's forces opened fire on the militants.
On Sunday, police said they stormed a militant hideout in a Greater Cairo district, killing 10 suspected militants and seizing a cache of weapons.
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While the group is based in North Sinai province, it has also carried out attacks elsewhere including in the capital, and has claimed attacks that have killed more than 100 Coptic Christians since December.
The officials spoke on condition of anonymity because they were not authorized to brief media.
The incident occurred some 30 kilometers west of Arish in northern Sinai, the heart of long-running militancy now led by the Velayat Sinai terror outfit.
There was no immediate comment from the Interior Ministry on Monday's attack.
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Directly after this attack, security forces launched intensive operations to arrest any IS members in Cairo and those who show affiliation to the group.
IS claimed it was behind the attack via its news agency Amaq.
Nine policemen, including four officers, were injured during the two raids, it said in a statement. That was the deadliest attacks in two years. Police said the militants had sneaked into Cairo from the volatile northern Sinai.
Hundreds of soldiers and police have been killed by militants affiliated to IS since 2013, when the Egyptian military overthrew Islamist President Mohammed Morsi.
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