Egypt hit by terror attacks in response to deadly shootings by security forces.

This is the description of the attacks from The New York Times:

"Unidentified gunmen in the Suez Canal city of Ismailia killed six soldiers, including a lieutenant, in a drive-by shooting, while a car bomb at the security headquarters in the southern Sinai town of El-Tor killed two police officers and injured nearly 50 other people, state media reported. In Cairo, assailants fired at least one rocket-propelled grenade through a satellite dish used to transmit Egyptian state television."

Taking them one-by-one:

Unidentified gunmen in the Suez Canal city of Ismailia killed six soldiers, including a lieutenant, in a drive-by shooting.-JUSTIFIED.

 a car bomb at the security headquarters in the southern Sinai town of El-Tor killed two police officers and injured nearly 50 other people. Target justified. Two state police officers killed?  Fifty "other people" injured?  Car bombs do not discriminate between civilians and state representatives. In America, police officers, while "state representatives" are a civilian para-military force. If that is what they are in Egypt, not justified. If in Egypt the police are just military personnel wearing a different uniform, justified. If the "50 other people" were civilians, even civilian, non-military employees of the "security headquarters," then not justified.

assailants fired at least one rocket-propelled grenade through a satellite dish used to transmit Egyptian state television. JUSTIFIED.