Five people, including three young children, have died in a house fire in northwestern Arizona, authorities said Sunday, adding it appeared no adults were home at the time.

Bullhead City police said the fire broke out around 5 p.m. Saturday and the victims did not make it out of the two-story duplex in that community near the Colorado River.

A city fire department spokeswoman said the five victims were ages 2, 4, 5, 11 and 13. Their names weren't immediately released Sunday.

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Authorities said the cause of the fire isn’t known yet.

Police said there reportedly were no adults home at the time, but officials gave few other details.

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The fire is being investigated by the city’s police and fire departments and other agencies including the federal Bureau of Alcohol, Tobacco, Firearms and Explosives.