A suicide bomber has killed two Algerian policemen this morning, AFP reports state media as saying.
It adds that one of the policemen threw himself on the attacker whose explosives belt then detonated.
The officers had intervened when the attacker tried to enter the police headquarters in the region of Tiaret, about 350 km (220 miles) south-west of the capital Algiers, the official APS news agency reported.
The attack was the second time this year that a suicide bomber has targeted Algerian police, AFP adds.
In February a policeman foiled an attempted suicide attack on a police station in the eastern city of Constantine. That attack was claimed by the so-called Islamic State.