AP NewsBreak: Probe finds Iraqi troops killed 2 American soldiersSCOTT LINDLAWAssociated Press SAN FRANCISCO - Two California soldiers shot to death in Iraq in 2004 were murdered by Iraqi civil-defense officers patrolling with them, military investigators have found.The deaths of Army Spc. Patrick R. McCaffrey Sr., 34, of Tracy and 1st Lt. Andre D. Tyson, 33, of Riverside were originally attributed to an ambush during a patrol near Balad, Iraq, on June 22, 2004.But the Army's Criminal Investigation Division concluded there was foul play after probing the circumstances for several months.