A police brigadier-general has been killed in a twin bomb blast near Cairo university, Egyptian state media say.
Five others were also injured in the attack, the health ministry confirmed.
The explosives were planted next to a police post, officials at the scene said. No group has so far said it carried out the bombings.
Egypt has witnessed several attacks against government targets by militant groups, following the ousting of the Muslim Brotherhood in July.
State TV named the officer as Tariq al-Mirjawi, the head of Giza’s investigation department.
Reports suggest the bombs went off a few minutes apart.
The explosions happened outside the faculty of engineering at the university.