The fire, the second in the region this month, swept through the single-storey building completely destroying two of the four apartments.
"The call was received at 03:04 a.m. (22:30 GMT)... Eight bodies - two of them children - were discovered in the debris," the spokesman said, adding that the children were believed to be six and 11 years old.
A two-year-old child and a woman were treated for smoke inhalation.
A fire investigation team is working at the scene to try and establish the cause of the fire. Arson is being examined as a possible cause, he said.
On February 2 eight people, including four children, died in a blaze in the same region after an oven overheated.