Mohammed Abdul-Razzaq, left, the father of Ali, the 9-year-old boy killed in the Sept. 16, 2007, shooting in Baghdad involving Blackwater Worldwide contractors, leaves the federal courthouse in Washington with prosecutor Stephen Ponticiello, right, Tuesday, May 27, 2008. At back center is another unidentified Iraqi who also appeared before a federal grand jury investigating the deadly Sept. 16 shooting in Baghdad. (AP Photo/Manuel Balce Ceneta)AP - Three Iraqis, including the father of a slain 9-year-old boy, appeared Tuesday before a federal grand jury investigating a deadly Sept. 16 shooting in Baghdad involving Blackwater Worldwide contractors.