WASHINGTON -- Italian prosecutors again sought arrest warrants Wednesday for six additional CIA operatives who they say took part in the abduction two years ago of a radical Islamic cleric. If granted, the prosecutors' request would bring to 19 the number of CIA personnel formally charged with the kidnapping in February 2003 of Osama Moustafa Hassan Nasr, better known as Abu Omar. Milan's chief terrorism prosecutor, Armando Spataro, originally sought warrants for all 19, described in official documents as "a substantial group of persons belonging to the CIA of the United States or directly linked to it." ...