Algerian officials say a gendarme died and three more were wounded when an explosive-laden car was driven into their command post in the southern city of Ouargla.
A statement issued by the military did not say whether the driver died in Friday's pre-dawn attack, which partially collapsed the post, or if the driver was caught or fled.
There was no immediate claim of responsibility for the attack in the city, some 800 kilometers (500 miles) south of Algiers.
A similar attack in March wounded 23 people at a command post in Tamanrasset, near the border with Mali. The attack was claimed by the Islamist extremist group MUJAO, which is among rebel factions that have taken over northern Mali.