The Egyptian army killed 13 extremist militants in an anti-terrorism campaign in northern and central Sinai, said the military, Trend reports citing Xinhua.
During the gunfight, nine soldiers were killed or injured, Egyptian military spokesman Gharib Abdel-Hafez said in a statement.
In early August, the army said it killed 89 militants in the northeastern province of North Sinai.
Bordering Israel and the Palestinian Gaza Strip, North Sinai has for years been a hideout for militants.