An ExxonMobil pipeline leaked an undetermined amount of crude oil into the Yellowstone River near Billings, Montana, prompting a burgeoning cleanup effort, officials said Saturday.
About 80 people from a regional response team were on site Saturday and 70 additional trained individuals were en route,Â an ExxonMobil spokesmanÂ said.
The cause was under investigation. SpokesmanÂ Kevin Allexon said no information was available Saturday on the pipeline's age, depth under the river and its maintenance record. The spokesman said he could not speculate on whether river conditions had anything to do with the incident.Crude leaked into the Yellowstone River, officials said.