Keystone pipeline could be shut down rest of the week

FREEMAN, S.D. (AP) - TransCanada Corp. says the Keystone pipeline is likely to remain shut down the rest of the week while officials investigate an apparent spill in southeastern South Dakota.

Oil was discovered on a 300-square-foot area in a field ditch near a Freeman-area pump station. About 100 workers are at the site removing soil and determining where the oil originated. A company spokesman says crews haven't found any pipeline damage.

TransCanada hasn't released the amount of oil or speculated on cleanup costs.

TransCanada says it has found no significant harm to the environment. State environmental officials are monitoring the cleanup to make sure it's handled properly.

The Keystone pipeline runs from the Canadian province of Alberta to refineries in Illinois and Oklahoma, passing through the eastern Dakotas, Nebraska, Kansas and Missouri.