RAPID CITY, S.D. (AP) - Friends of a woman and three grandsons who died in an apartment building fire in Rapid City gathered at the scene for a candlelight vigil.

The blaze on Nov. 27 killed 51-year-old Marcia Rock, 9-year-old Thomas Rosado, 5-year-old Dustin Rosado and 3-year-old Marquez Hawk Wing. All four died of smoke inhalation.

About two dozen people gathered on Thursday night to remember the victims, lighting candles and exhibiting crosses with their names as well as photographs.

Fire investigators believe the blaze was caused by the actions of a building resident but they do not believe it was malicious in nature. The exact cause has not been released.

Seventeen other people who lived in the building were able to escape.

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