Six police officers have been wounded after two bombs went off in Cairo, the Egyptian health ministry says.
The blasts were heard at around 09:45 local time (07:45 GMT) in the Giza area and were around two minutes apart.
Local media report that the bombs targeted police vehicles stationed near a bridge.
Armed groups have stepped up their attacks in Egypt since the ousting of President Mohamed Morsi by the military in 2012.
A BBC journalist at the scene says there is little obvious damage to the area.
The attacks took place in Giza Square, a regular route for marches against the current government.
Anti-military protests are expected in parts of the capital later, after Friday prayers.
Last month, six people were killed in four separate bomb attacks in Cairo.
An al-Qaeda-inspired militant group called Ansar Beit al-Maqdis claimed responsibility for last month's attacks.
(BBC News)
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