Ethiopia's armed forces say they have killed more than 30 rebels during several days of fighting in Ogaden in the east of the country.
Officials says 300 rebels from the Ogaden National Liberation Front crossed over the border from Somalia.
They said 30 of them had been captured, along with various weapons, but there is no word of any army casualties.
The rebels, who are ethnic Somalis, have fought for the secession of the Ogaden region since the early 1990s.
Insecurity in Ogaden is one reason why parliamentary elections in the Somali region have been scheduled to take place four months after the rest of Ethiopia goes to the polls, says the BBC's Mohamed Adow in Ethiopia.
The government blames ONLF's activities for a lack of meaningful development in the region.