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Guyger was arrested on a manslaughter charge after she shot and killed Botham Jean earlier this month. An arrest affidavit obtained by Fox News said Botham allegedly ignored Guyger's "verbal commands" before she opened fire.

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The massive crash followed days of heavy rain in the area, which had elevated the river below the railroad bridge to a record high earlier in the week. As of early Sunday afternoon, the Floyd River was still barely above flood stage at 13 feet, meteorologist Kyle Weisser with the National Weather Service in Sioux Falls, South Dakota, told the Register.

Espinoza said an estimated 37 of the train's 95 cars derailed. The train, on its way to North Platte, Nebraska, from Mankato, Minnesota, was carrying industrial sand and soybean oil. Some of the sand spilled into the river.

Twenty of the derailed cars fell into the river, according to Union Pacific. The bridge beneath the train was destroyed.

Oltmans said the bridge over the river is "gone ... laying in pieces underneath the train." Several local fire departments, county officials and Union Pacific personnel responded to the early morning crash.

Oltmans said people living three or four blocks away from the bridge heard the loud crash, the second train derailment of the year in northwest Iowa.

Weisser said that the area of the state around Alton received 4-8 inches of rain earlier in the week. According to weather service measurements, Alton received 4.58 inches of rain between Tuesday and Friday.

The heavy rains forced the city to close a section of Third Avenue that goes above the river, Oltmans said. It was still closed as of Sunday afternoon.

The Floyd River, Weisser said, peaked on Thursday afternoon at 21.96 feet - about 12 feet above flood stage. When the train derailed, the weather service's measurements showed the fallen cars acting as a temporary dam for the river.

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