Escape from jail or custody by force or violence without setting fire to jail; penalty

If any person lawfully imprisoned in jail and not tried or sentenced on a criminal offense escapes from jail by force or violence, other than by setting fire thereto, or if any person lawfully in the custody of any law-enforcement officer, as defined in § 18.2-57, on a charge of criminal offense escapes from such custody by force or violence, he is guilty of a Class 6 felony.