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Auburn University researchers said oil mats submerged in the seabed more than a year after the biggest oil spill in U.S. history pose long-term threats to coastal ecosystems across the northern Gulf of Mexico. The study, released on Tuesday by the school's engineering department, showed that tarballs churned to the surface by Tropical Storm Lee and deposited along Alabama beaches this month had "essentially identical" chemical composition as samples taken from mats after the Deepwater Horizon oil spill. "Our interpretation of these observations is that submerged tar mats buried offshore of this coastline are breaking apart to yield these tar balls," the study reads, estimating the tarballs in question contained about 17 percent oil by mass.

An oil pipeline in northwestern US state Montana has ruptured and spilled crude oil into the Yellowstone River, a key tourist attraction in the region that runs through a famed national park, the pipeline operator acknowledged late Saturday.

A year after the largest offshore oil spill in U.S. history, some experts are pondering the next doomsday scenario - a massive oil well blowout in the icy waters off Alaska's northern coast.

A year after an oil spill in the Gulf of Mexico, scientists and biologists are getting their first real idea of how much damage was done to the regionís population of sea turtles as the females begin heading to coastal shores to nest. The greatest concern has been for the Kemps ridley, the smallest sea turtle and the most endangered.

The United States cannot rule out another oil disaster in its waters, the official who led the response to last year's Gulf of Mexico spill told AFP, as the country marks one year since the tragedy.

The Deepwater Horizon oil spill of 2010 devastated the Gulf of Mexico ecologically and economically. However, a new study published in Conservation Letters reveals that the true impact of the disaster on wildlife may be gravely underestimated. The study argues that fatality figures based on the number of recovered animal carcasses will not give a true death toll, which may be 50 times higher than believed.

Last October, a containment dam belonging to a Hungarian alumina manufacturer collapsed after heavy rains, releasing 200 million gallons of caustic sludge. Eight people died in the flood of lye-like red mud, which overwhelmed nearby towns and created an environmental catastrophe.