The United States plans to increase its military force in Iraq in an effort to stabilize the country. U.S. officials said nearly 20,000 troops would arrive in Iraq over the next few weeks. This would increase the U.S. force level to about 163,000 troops. Currently, about 145,000 U.S. soldiers are deployed in Iraq. U.S. troops have disarmed a militia group affiliated with pro-American Iraqi politician Ahmed Chalabi, as part of a campaign to impose law and order in Iraq, a political official said Sunday. But fighters of the biggest Muslim Shi'ite group, trained by Washington's bitter foe Iran, reacted warily...