Three explosions have hit high-profile targets in Cairo, killing at least five.
In the first blast, a car bomb detonated in front of a police building, killing at least four and wounded scores.
The second blast, near a Cairo subway station, killed at least one person and injured 15.
A third blast targeted a police station in Giza, on the capital's outskirts. There are no reports of casualties in that attack.
No one has yet claimed responsibility for any of the attacks.
Islamic extremists have increasingly targeted police and the military since the July 3 coup against President Muhammad Morsi and a fierce crackdown on his supporters, led by the Muslim Brotherhood.
The explosions come a day before the anniversary of the start of the 2011 uprising that toppled Egypt's longtime ruler Hosni Mubarak.
Based on reporting by Reuters, AP, AFP, and dpa