Crews shut down the pipeline Thursday morning, and officials are investigating the cause of the leak.
This is the largest Keystone oil spill to date in South Dakota, said Brian Walsh, a spokesman for the state's Department of Environment and Natural Resources.ÿ
Read more...[1]
----------------------------------------------
Get complete coverage of breaking news on CNN TV[2], CNN.com[3] and CNN Mobile[4].
Watch CNN live or On Demand from your computer or mobile device using CNNgo[5]. ----------------------------------------------