BNSF: Estimated 230,000 gallons of oil spilled in derailment

In this aerial drone image taken from video and provided by the Sioux County Sheriff's Office, tanker cars carrying crude oil are shown derailed about a mile south of Doon, Iowa, Friday, June 22, 2018. About 31 cars derailed after the tracks reportedly collapsed due to saturation from flood waters from adjacent Little Rock River. (Sioux County Sheriff's Office via AP)