The official, who refused to be named because he was not authorized to speak to the media, said the attacker drove an explosive-laden vehicle into a 12-truck convoy near the town of Zemmouri on Wednesday. Two soldiers in one of the trucks were killed, as was a civilian and the suicide bomber.

The 20 other soldiers in neighboring trucks were injured.

Suicide attacks are rare in Algeria, though the North African country sees occasional violence. Armed hard-line Islamic groups have aligned with Al-Qaeda to stage scattered bombings and other attacks, usually targeting security forces.