A violent attack upon an internationally protected person (asdefined in section 1116(b)(4) of title 18, United States Code) or upon the liberty of such a person.???(IV) An assassination.???(V) The use of any--???(aa) biological agent, chemical agent, or nuclear weapon or device; or???(bb) explosive, firearm, or other weapon or dangerous device (other than for mere personal monetary gain),with int