A rocket-propelled grenade has been fired at a state-owned satellite station in Cairo, wounding two people, security officials have said.
There was no immediate claim of responsibility for the attack.
Earlier, gunmen killed five Egyptian soldiers near the Suez canal as further violence swept the country.
Egypt has experienced widespread unrest since Mohamed Mursi was removed from office by the army in July.
More top news
Sadiq Khan has weighed in on the debate over the burkini being banned on some French beaches saying women should not be told what to wear.
The USA women's football team goalkeeper Hope Solo has received a six-month suspension for comments made.
The mobile messaging service Whatsapp is going to start sharing users' phone numbers with Facebook, to ensure "better friend suggestions".