(CNN) -- A Somali woman and five of her daughters were killed Saturday night in an apartment fire in Stockholm, Swedish authorities said.
The 42-year-old and her family had attempted to escape the fire and smoke via the stairs and were found in the stairwell of the six-story building, police said. The woman's sixth daughter is in hospital in a critical condition. The youngest victim was around one-year-old.
The family lived in an apartment above the fire. A resident of another apartment in the building was also taken to hospital.
Police said the cause of the blaze, which started in a ground floor apartment, was not yet known.
"There are no signs to suggest that a crime is behind the fire, but we have started an investigation into the cause of the fire," Stockholm police spokeswoman Karin Solberg said.
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