Canadian authorities said they have recovered at least 40% of more than 1,500 barrels of oil which have leaked into a major river.
But officials said the spill is still moving downstream and could threaten the drinking water of riverside communities.
It comes after heavy oil and diluent leaked from Husky Energy’s Saskatchewan Gathering System pipeline last week and flowed into the North Saskatchewan River.
Five booms have been built to help contain the spill with Husky Energy and the federal government working on a cleanup plan.
Husky said the cleanup at the site of the leak had been completed, although neither it nor the province gave a time line for resolving the issue entirely.
The company also said three birds had been “impacted” by the spill and that one died.
It was not immediately clear what caused the spill, which the province said first appeared 300 metres from the river, a figure revised from an earlier one of 600 metres.