Four Third Field Army recruits were killed and nine others were injured on Sunday morning after unidentified gunmen opened fire on their bus.
The incident took place in Matla area in central Sinai as the soldiers were on their way to a vacation.
The army forces exchanged fire with the gunmen who were traveling in a Land Cruiser pickup.
The injured were taken to the Suez Military Hospital.
A military source said that the bus was attacked by masked extremists.
Edited translation from Al-Masry Al-Youm