An Egyptian police brigadier-general was killed in Cairo on Wednesday, state TV reported, in what security sources said was a twin bomb attack outside Cairo University.
A senior security official told Reuters several people were also wounded in the blasts.
A state TV correspondent said at least four other police officers were wounded in the blasts, which the security sources said went off near a police vehicle.
One person was killed in a third explosion at Cairo University shortly after twin bombs killed a police brigadier general there, security officials said.
Bombings and shootings targeting the security forces have become commonplace in Egypt since the army deposed President Mohammad Mursi.
Qouting al Manar website