TULSA, Okla. (AP) — Federal prosecutors from as far away as New York and Florida are helping the U.S. attorney in Tulsa, Oklahoma, deal with what he described Tuesday as a "tidal wave" of new cases resulting from a recent U.S. Supreme Court decision.

U.S. Attorney for the Northern District of Oklahoma Trent Shores said the number of criminal indictments more than doubled in the last month as a result of the ruling in McGirt v. Oklahoma, which determined that a large swath of eastern Oklahoma remains a Muscogee (Creek) Nation Indian reservation. As a result, either the federal government or the...