BARBERTON, Ohio -- The Environmental Protection Agency is cleaning up a chemical spill in the Tuscarawas River near Barberton.

Authorities are not sure of the exact source of the spill.

They said the oil is traveling through a sewer and into the river. Now crews must track down how it's getting into the sewer.

The EPA used containment measures at four different locations. No more oil is coming flowing into the river. It is contained to one area.

So far, the EPA said the oil may only be a threat to vegetation.