BISMARCK, N.D. — A federal judge in North Dakota has granted a seventh trial delay for a flight attendant accused of disrupting SkyWest flights with bogus bomb threats last year.

Justin Cox-Sever was to stand trial next week — a year after his original trial was scheduled. Federal prosecutors said in court documents that they needed more time to work with their counterparts in Virginia, where the Arizona man also faces charges. They also said ongoing protests against the Dakota Access oil pipeline in North Dakota are “consuming significant time and attention.”

Police have made nearly 575 arrests since August during protests of the $3.8 billion pipeline to carry North Dakota oil to a shipping point in Illinois. Opponents worry it could harm the environment and threatens tribal artifacts.