Three siblings died in a fire in their family's dwelling in a poor section of Tegucigalpa, the capital of Honduras, fire department spokesman Oscar Triminio said Sunday.

The fire broke out Saturday night in the wooden structure in Villa Cristina, a district on the east side of the capital, while the children were home alone, Triminio said.

The siblings, ages 1, 2 and 6, died from "asphyxiation and burns," the fire department spokesman said.

The children's parents were working and had locked them in the dwelling, which was made from wood and sheets of zinc, emergency services officials said.

Investigators are trying to determine the cause of the blaze, which completely destroyed the dwelling and burned the children.

A charcoal grill may have started the blaze, firefighters said, adding that the children were sleeping in the dwelling's kitchen. EFE