TransCanada Corp. says the company has sent additional crews and equipment to the site of a 210,000-gallon oil spill in South Dakota from its Keystone pipeline.
TransCanada said Saturday it is making progress in its investigation into the spill cause on farmland in Marshall County, near the North Dakota border, about 402 kilometres west of Minneapolis.
READ MORE: Keystone Pipeline shut down after spilling nearly 800,000 litres of oil in U.S.
But the company did not elaborate on the cause. The company says additional equipment and workers continue to be dispatched to the site.
Company spokesman Terry Cunha said Sunday that about 150 people are now at the site. Cunha said a gravel road has been completed to handle heavy equipment.
Crews shut down the pipeline Thursday after discovering the leak.
TransCanada said the leak is under control and there is no significant environmental impact or threat to the public.
Nebraska regulators vote Monday on a proposed Keystone XL route, an expansion that also would be operated by TransCanada.
READ MORE: Nebraska to announce decision on Keystone XL pipeline on Monday