The civil defense was “continuing efforts to put out the fire” in the Mohammadia district of Algiers, with the cause of the blaze unknown, AFP reported.
“The provisional toll is 11 dead,” it said, without specifying the age of the victims.
National television showed Prime Minister Sifi Ghrieb visiting the wounded in hospital.
Algeria has been sweltering under a heatwave for several days, and nearly 1,000 fires have been recorded in the space of a week.