Nearly half of Iowa crude oil spill contained, BNSF says

(Reuters) - Workers have contained nearly half of the crude oil spilled near Rock River in northwest Iowa over the weekend following a freight train derailment on Friday, BNSF Railway Co said. About 100,000 gallons had been hemmed off using booms out of the estimated 230,000 gallons spilled, BNSF said in a statement on Saturday. The spill has raised concerns about drinking water downstream.