Four suicide bombers attacked a market and town on Monday in Cameroon's Far North region near the border with Nigeria.
The explosions left more than 30 dead and at least 60 others injured.
Two attackers targeted the market in Bodo and two others detonated explosives in town.
Officials suspect Nigerian terror group Boko Haram to be behind the attacks.
Boko Haram: Basics
Boko Haram is an armed group blamed for killing thousands of people in northeastern Nigeria and other parts of Africa. The group claims to be fighting for the creation of an Islamic state in Africa and has announced its allegiance to ISIS.
A brief profile of Cameroon
Officially the Republic of Cameroon, it is bordered by Nigeria to the west; Chad to the northeast; the Central African Republic to the east; and Equatorial Guinea, Gabon, and the Republic of Congo to the south.