Another summer, another broken oil pipe. Up to 1,000 barrels of crude oil flowed into Montana's Yellowstone River when an ExxonMobil pipe beneath the riverbed broke Saturday. Cleanup crews deployed booms and absorbent material as the plume traveled downstream, but some of the oil flowed underneath the blockages. Nearby residents were told to evacuate temporarily out of fear of an explosion and the powerful fumes. ExxonMobil says the pipe has now been shut down and that they're sending a team to clean up the mess.