WASHINGTON, Feb. 21, 2007 – The Baghdad security operation that began last week has quelled certain violent acts in the Iraqi capital, a U.S. military spokesman in Baghdad said today. “There has been a significant reduction in sectarian incidents and in ex-judicial killings in Baghdad,” Army Maj. Gen. William Caldwell, a Multinational Force Iraq spokesman, told reporters via satellite connection from a news conference in Iraq. Caldwell acknowledged that new security efforts have been hampered by vehicle-bomb and suicide-vest attacks. But combined forces are beginning to achieve success in “stopping the vehicles from getting into the crowded areas where...