. . " protected person (as defined in section 1116(b)(4) of title 18) or upon the liberty of such a person. (IV) An assassination. (V) The use of any ??? (a) biological agent, chemical agent, or nuclear weapon or device, or (b) explosive, firearm, or other weapon or dangerous device (other than for mere personal monetary gain), with intent to endanger, directly or indirectly, the safety of one or more" . . . . .