Energy Transfer Partners LP on Tuesday sued Greenpeace and other environmental groups, accusing them of launching an "eco-terrorism" campaign aimed at blocking the Dakota Access Pipeline, the center of months of opposition by Native American and green groups. The pipeline operator said Greenpeace, Earth First and other organizations engaged in "acts of terrorism" to solicit donations and interfere with its pipeline construction activities, damaging its "critical business and financial relationships." ETP said the groups' actions and negative publicity against it, its sister company Energy Transfer Equity LP and other firms caused billions of dollars in damages. Greenpeace USA General Counsel Tom Wetterer said the company's lawsuit, filed in U.S. district court in Bismarck, North Dakota, "abuse(d) the legal system to silence legitimate advocacy work." In May the $3.8 billion Dakota Access Pipeline began interstate crude oil delivery, but a federal appeals court judge in June ordered the U.S. Army Corps of Engineers to reconsider its environmental review of the line, opening up the possibility that the line could be shut at a later date.