NEW : 3 U.S. soldiers killed in 2 roadside bombs ; total U.S. death toll at 4,062 . Government attacks on militants will stop when insurgency stops , official says . Official : Taliban spokesman claims attack was revenge for killing of a senior commander by Afghan forces last week. Most of the deaths occurred in and around Baghdad , and most were combat-related . Iraqi security forces , Shiite militants have been fighting in Sadr City for weeks .
NEW : 3 U.S. soldiers killed in 2 roadside bombs ; total U.S. death toll at 4,062 . Government attacks on militants will stop when insurgency stops , official says . Official : Taliban spokesman claims attack was revenge for killing of a senior commander by Afghan forces last week. Iraqi security forces , Shiite militants have been fighting in Sadr City for weeks .