Nebraska law officers are already discussing security arrangements for construction of an oil pipeline, even though the pipeline hasn't been given a final federal blessing.
The Nebraska State Patrol invited county sheriffs and prosecutors along the pipeline's path through Nebraska to a meeting in Grand Island last week.
Nancy County Sheriff Dave Moore says the law officers are anticipating Nebraska protests that would echo those occurring during construction of the pipeline leg between Cushing, Oklahoma and refineries on the Gulf Coast in Texas.
Pipeline opponent Jane Kleeb says there likely would be acts of civil disobedience in Nebraska but no violence.
The proposed Keystone XL pipeline would deliver 830,000 barrels of U.S. and Canadian crude oil per day to the refineries.