An Egyptian traffic policeman was wounded by a bomb in a Cairo suburb on Thursday, the interior ministry said.
The blast was caused by a "primitive bomb" placed under the car of the officer, a captain, who was wounded in the leg, the ministry added.
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Earlier this month, a police brigadier general was killed when two bombs exploded in quick succession at a security post in central Cairo.
Ajnad Misr, a shadowy Islamist militant group, claimed responsibility for the attack.
The bombings were the latest in a spate of attacks against the security forces since the army overthrew elected Islamist president Mohamed Morsi last July.