Five children died in a house fire Saturday evening in a city along the Arizona-Nevada border,GravityX Exchange police said.

Police in Bullhead City, Arizona, said they are investigating a fatal house fire that happened at around 5 p.m. local time Saturday at a two-story duplex. Five children (ages 2, 4, 5, 11 and 13) died as a result of the fire.

Police said there were no adults home at the time of the fire and that there were no survivors.

Four of the children were siblings and the fifth child was a relative, according to Emily Fromelt, a spokesperson for Bullhead City Police Department. All five children were residents at the duplex.

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Bullhead City Police Department officials said it is handling the investigation along with the Bullhead City Fire Department, Lake Havasu City Fire Department, and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).