"Keystone Pipeline Springs Leak In South Dakota"

"A key section of the Keystone pipeline has been shut down due to an oil spill in South Dakota, TransCanada said on Monday.

TransCanada (TRP), which operates the pipeline, reported a spill of about 187 gallons of crude oil to the Coast Guard's National Response Center on Saturday afternoon.

The company said in a statement it is removing the oil and investigating the source. TransCanada said "no significant impact to the environment has been observed." The incident along the controversial pipeline is located about four miles away from the Freeman pump station in Hutchinson County, South Dakota.

A portion of the Keystone pipeline that transports oil from Alberta, Canada to Cushing, Oklahoma will be shut down until at least Friday. The section that connects Cushing to Texas remains in operation."

Matt Egan reports for CNN April 4, 2016.