TITLE 18—CRIMES AND CRIMINAL PROCEDURE
CHAPTER 118—WAR CRIMES
§ 2441. War crimes
(c) (4) of a person who, in relation to an armed conflict and contrary to the provisions of the Protocol on Prohibitions or Restrictions on the Use of Mines, Booby-Traps and Other De-vices as amended at Geneva on 3 May 1996 (Protocol II as amended on 3 May 1996), when the United States is a party to such Protocol willfully kills or causes serious injury to civilians.
Intentionally directing attacks against the civilian population - IAC
EDIT.