NEW : A total of 3,983 military personnel have died in the nearly 5-year-old war . Suicide bomb kills 3 U.S. soldiers and an interpreter in Diyala province . Earlier , at least 5 U.S. soldiers on border patrol killed in Baghdad suicide bombing . Baghdad bombing marks deadliest attack on American troops since January 28 . Female suicide bomber kills sheik , 5-year - old niece and guard at Iraqi home .
NEW : Suicide bomb kills 3 U.S. soldiers and an interpreter in Diyala province . Earlier , at least 5 U.S. soldiers on border patrol killed in Baghdad suicide bombing . Baghdad bombing marks deadliest attack on American troops since January 28 . Female suicide bomber kills sheik , 5-year - old niece and guard at Iraqi home .