The story

A fire that claimed the lives of 44 children at a day-care center in Hermosillo, Mexico, started Friday in an air-conditioning unit in an adjacent warehouse, the attorney general of Sonora said Monday.

Investigators have not determined whether the fire was caused by an overheated motor or deficiencies in its installation, said Abel Murrieta Gutierrez, according to the state-run news agency Notimex.

However it started, there's no doubt it moved toward papers in bookshelves on the wall shared with the building housing ABC Day Care, where 141 children and day-care workers were, he said. Read full article »

CNN's Mariano Castillo in Atlanta and CNN en Español's Rey Rodriguez in Hermosillo contributed to this story.

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