Attacks in Baghdad killed three Iraqis on Sunday and four US soldiers died in an ambush in the city on Saturday. A <b>roadside bomb</b> killed two Iraqi policemen and a mortar attack left one civilian dead. The American troops' unit was hit by a <b>roadside bomb</b> and then came under small-arms fire. <A HREF="http://news.bbc.co.uk/1/hi/world/middle_east/6463529.stm" target="_blank">http://news.bbc.co.uk/1/hi/world/middle_east/6463529.stm</A>