Ethiopian troops surround an area in South Sudan where abducted Ethiopian children are being held
The children were taken in a cross-border raid in the Gambella region last Friday, in which 208 people died.
The government has said members of the Murle community were responsible.
Flags have been flying at half mast in Ethiopia as the country mourns those who were killed.
A government official in Gambella said that the abducted children would soon be rescued, the government-affiliated Fana Broadcasting Corporate reports.
South Sudan acting Foreign Minister Peter Bashir Gbandi is set to travel to Ethiopia’s capital, Addis Ababa, on Friday to coordinate the mission, the AP news agency reports.
The area where the children are being held “is full of jungle”, AP quotes Mr Bashir as saying.