A car bomb has killed a policeman in Sixth October City on the outskirts of Cairo, an interior ministry aide told CBC Extra private satellite channel on Wednesday morning.
Unidentified assailants placed a homemade device below the car of Central Security Forces officer Ahmed Zaki, which blew up when he started the engine.
Explosives experts are searching the area for further devices.
Attacks, mainly against security personnel and installations, have grown common since the ouster of Islamist president Mohamed Morsi last summer.
