18 U.S.C. § 3238: Offenses not committed in any district

The trial of all offenses begun or committed upon the high seas, or elsewhere out of the jurisdiction of any particular State or district, shall be in the district in which the offender, or any one of two or more joint offenders, is arrested or is first brought; but if such offender or offenders are not so arrested or brought into any district, an indictment or information may be filed in the district of the last known residence of the offender or of any one of two or more joint offenders, or if no such residence is known the indictment or information may be filed in the District of Columbia.