A small bomb was detonated in the Martyrs Square in the Algerian capital on Wednesday, reported Monte Carlo radio.
Eleven people were wounded by the blast, which no group claimed responsibility for, said the radio station.
Earlier in the day, two soldiers were killed and a third wounded in an ambush staged by alleged Islamic militants near Algiers, said reports.
AFP reported on Tuesday, meanwhile, that Algerian soldiers killed six armed Islamists from the hardline Salafist Group for Preaching and Combat (GSPC) group at the weekend in two separate operations in northern Algeria.
Quoting the Daily Oran, the agency said five GSPC members were killed Sunday in an ambush by soldiers in Boumehir, near the group's stronghold in Sidi Ali Bounab in Kabylie, some 100 kilometers (60 miles) east of Algiers.
Security forces killed another GSPC member in Boudouaou, 40 kilometers (25 miles) east of the capital on Sunday, and seized a load of documents during the operation, L'Expression reported, without giving details.
Meanwhile, hospital staff on Monday reported that seven people, including a baby, were killed and one injured in an attack the same day by armed extremists in a village in western Algeria.
The attack took place in El Houala, some 360 kilometers (225 miles) west of Algiers, in the Mascara region, a stronghold of the Armed Islamic Group (GIA).
Some 80 people have been killed in Algeria since the beginning of August in ongoing violence linked to armed groups, according to a tally compiled by local media.
More than 100,000 people, mainly civilians, have lost their lives in Algeria's civil war since 1992, when the army interrupted elections that the now outlawed Islamic Salvation Front (FIS) was certain to win – Albawaba.com
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