Seven United Nations peacekeepers from Niger have been killed in an ambush in Ivory Coast.
The soldiers were on patrol near the border with Liberia when they came under attack.
It is understood to be the first incident of its kind in the country.
UN chief Ban Ki-moon has called on the government to track down those responsible.
“I’m saddened and outraged. These brave soldiers died in the service of peace. I condemn this attack in the strongest possible terms,” Ban said.
The troops were killed near the towns of Para and Tai, an area where there has been a number of cross-border attacks during recent months.
Ivory Coast is slowly recovering from months of violence that followed presidential elections.
The UN peacekeeping force, which was deployed in 2004 to help end the country’s civil war, is 11,000 strong.