Environmental groups are calling for full disclosure from Exxon to determine whether tar sands corrosion played a role in the Yellowstone oil spill. Dirty fuels campaigner at Friends of the Earth, Alex Moore says tar sands oil can corrode pipelines more quickly.

Moore says full discloser is a must in these type of situations.

Moore says Exxon did admit carrying the tar sands oil and government officials are currently looking into it.