Police and U.S.-led coalition forces attacked militants planting a roadside bomb in eastern Afghanistan, killing one insurgent but also two civilians, Afghan officials said Monday. A coalition spokesman confirmed the incident in Nangarhar province but not the civilian casualties, and said the operation was ongoing. Zalmay Dadak, mayor of Khogyani district, said police fatally shot one suspect shortly before midnight Sunday and gave chase to the others.A helicopter from the U.S.-led coalition fired at the militants, but also hit a house in a village, killing a man and a 4-year-oldboy, Dadak said.