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
Arkansas has become the first US state in 17 years to carry out back-to-back executions after putting two inmates to death.
Up to three million children risk going hungry over the school holiday, with increasing numbers of families relying on food banks, MPs warn.
Tuesday will be a cold and windy day across the British Isles with a mix of sunshine and showers.