Unidentified armed men have killed five police officers in an attack on security forces in northern Burkina Faso in which about 15 of the attackers died, the security ministry says.
The incident occurred in Sourou province in the borderlands near Mali, where Islamist groups have increased attacks in recent years despite international efforts to stamp them out.
The attackers struck at 5am on Sunday and about 15 of them were killed in the ensuing fight, the ministry said.
Islamist attacks have surged across Africa's Sahel region, killing thousands and driving millions from their homes in Burkina Faso, Mali and Niger.
About 1.2 million people have been displaced by the violence in Burkina Faso alone.