Neighbors describe frantic effort to enter burning Arizona home where 5 kids died: "Screaming at the tops of our lungs"

Neighbors described a frantic effort to enter a burning house in Arizona where five children were trapped, saying they "did everything we could" to get inside. The chilling accounts came after a father who left four children and a young relative at the home so he could buy Christmas gifts and groceries returned to find the charred remains of the family's home after a fire broke out, killing all five children inside, authorities said.

Investigators in northwestern Arizona said Tuesday they have yet to determine what started the blaze, which began Saturday evening in the downstairs foyer area of the two-story duplex. Flames and smoke traveled up the only staircase inside the home, preventing the children from escaping.

Their bodies were all found in an upstairs bedroom, investigators said.