At the time of the attack, Burkinabe soldiers were escorting a convoy of civilians in Seno Province. The convoy was leaving Dori and headed to Arbinda, and was ambushed in the village of Boukouma around 2pm on August 18.[3] The convoy was made up of eighty vehicles and stretched for 600 meters, many of the civilians vehicles going in the convoy to bypass jihadist checkpoints along the road.[4][5] The gendarmes were positioned at the front and back of the convoy, with no defenses in the center.[3] The jihadists ambushed the convoy in the center, with gendarmes responding immediately. After three hours of fighting, the jihadists were repelled from the convoy.[3]
An initial toll from the Burkinabe government stated that 30 civilians, 14 Burkinabe soldiers, and three VDP militiamen were killed and nineteen others were injured.[6] The next day, this toll was revised to over 80 people killed including 65 civilians, 15 gendarmes, and 6 militiamen.[3][4] Burkinabe officials also stated that 58 jihadists were killed in a counter-attack.[6]
President Roch Marc Christian Kaboré declared a three-day period of national mourning.[6] Jama'at Nasr al-Islam wal-Muslimin claimed responsibility for the attack on August 22, and released images of captured weapons and motorcycles from the convoy.[7]