An unidentified gunman killed two retired military officers and a soldier at a highway toll station south of the Egyptian capital, the military said Wednesday.
The deaths were "a result of a terrorist individual opening fire on a toll collection station in al-Ayyat," a town about 50 kilometres south of Cairo, the military said.
It did not say when the attack happened.
The toll station is run by a company under the military, according to the statement.
The Egyptian military operates in many civilians fields, including building and maintaining roads.
"The area is being combed in search for the perpetrators," the military said.
The country is battling an insurgency in the north of the Sinai Peninsula by an affiliate of the Islamic State group, which has targeted security personnel and has increased its attacks against Christians since December.
Newly emerged groups have also carried out attacks, including Hasam, which has claimed responsibility for several assassinations and attacks in Cairo and the Nile Delta.
The deaths were ,a result of a terrorist individual opening fire on a toll collection station in al-Ayyat,, a town about 50 kilometres south of Cairo, the military said.
