Militants fired on a Central Security Forces camp in Arish, North Sinai Monday morning, fleeing into the desert when security forces fired back.
No casualties were reported.
A security source said this was the second attack on security forces in 24 hours, adding that the forces combed the desert but could not find the gunmen.
Sinai has seen intermittent clashes between security forces and militants since early August when 16 Egyptian soldiers were killed by unidentified gunmen in Rafah.
Three more policemen were killed in another attack on a police patrol in the Gisr al-Wadi district in Arish early last week, prompting the police to protest for better equipment to defend themselves.
Edited translation from Al-Masry Al-Youm