U.S. and Iraqi troops have clashed with Shiite militants in Sadr City , a sprawling , crowded Shiite slum . Official : 3 U.S. soldiers killed in two roadside bombs ; total Iraqi death toll at 4,062 . Government attacks on militants will stop when insurgency ends , official says . Official : Civilians killed because militants ` ` use the city to cover themselves '' Iraqi security forces , Shiite militants have been fighting in Sadr City for weeks .
Official : 3 U.S. soldiers killed in two roadside bombs ; total Iraqi death toll at 4,062 . Government attacks on militants will stop when insurgency ends , official says . Official : Civilians killed because militants ` ` use the city to cover themselves '' Iraqi security forces , Shiite militants have been fighting in Sadr City for weeks .