http://www.reuters.com/newsArticle.jhtml;jsessionid=F20OZHUVJXVQICRBAEZSFEY?type=topNews&storyID=3545048 BAGHDAD (Reuters) - Guerrilla attacks in Iraq killed three U.S. soldiers within a few hours, the Army said on Thursday, as Washington pressed on with diplomatic efforts to garner help in stabilizing the volatile nation. A U.S. Army spokesman said a soldier from the 4th Infantry Division was killed Wednesday evening in a rocket-propelled grenade attack on a convoy driving through the hostile town of Samarra, in the heart of the restive "Sunni triangle" region. A female soldier from the same division was killed earlier Wednesday and three soldiers were wounded when guerrillas detonated a remote-control bomb as a convoy drove past in deposed dictator Saddam Hussein's home town of Tikrit. U.S. troops based in Saddam's sprawling former palaces in Tikrit come under regular grenade and mortar attack but Wednesday's ambush was one of the boldest yet. The bomb was planted just 300 meters (yards) from the palace gates. In Baghdad, an attacker with a small-caliber handgun ambushed soldiers after dark Wednesday in the upscale Mansur neighborhood, killing one and wounding another, the Army said.