The official told Associated Press that early Friday the troops stormed a house in Sheik Zweid, close to Rafah border crossing with Gaza Strip, and caught the nine while they were asleep.
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Among them was Selmi Zeyoud, whom the official described as a "dangerous element" and a brother to a slain jihadist. The official spoke on condition of anonymity because he was not authorized to speak to the press.

Egypt's President Morsi in Sinai after attack (Photo: AFP)
The arrests are the first since Sunday's surprise attack in which armed terrorists from Sinai breached Israel's border in an armored personnel carrier they seized during a raid on an Egyptian border checkpoint as the border guards broke their daily fast for the holy month of Ramadan with a sunset meal.
After the gunmen stormed the checkpoint, they killed 16 Egyptian soldiers, then drove into Israel.