They said the policemen were heading to the town of el- Arish today when gunmen attacked the car they were riding in and opened fire, killing one police officer, a low-ranking policeman and two conscripts.
The officials spoke on condition of anonymity because they were not authorized to brief reporters.
Egypt in recent years has been battling a stepped-up insurgency in northern Sinai, mainly by militants from an Islamic State group affiliate.
The campaign accelerated after the military ousted elected Islamist President Mohammed Morsi in 2013.
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