A bomb exploded on Friday afternoon near Radubis cinema on Haram street in Giza, killing one person and injuring four others.
Police claimed that it is likely that Muslim Brotherhood demonstrators had planted an explosive device before forces were able to disperse them earlier today, so that the bomb would explode at police on their way back.
All the injured were taken to Haram Hospital, while police listened to eye-witness accounts.
A security cordon was imposed around the area and authorities were searching for more explosives.
This is the fourth explosion to take place on Friday, on the eve of the third anniversary of the 25 January revolution.
The first blast took place early in the morning, when a car bomber attempted to storm the Cairo Security Directorate building, leaving four dead and 83 others injured.
An IED also exploded near Behouth metro station, killing a police recruit and injuring nine others.
A third explosion took place in the Talbiya neighborhood of Haram, but no one was hurt.
Edited translation from Al-Masry Al-Youm
