BAGHDAD - Three more US soldiers have died in Iraq, two of them in action and one in a separate incident, a military statement said. One soldier was killed by a roadside bomb attack while fighting in support of an air assault on insurgent targets southwest of Baghdad, and another “died as a result of injuries sustained from an explosion” in northern Iraq, Sunday’s statement said.In the third incident, a soldier from Task Force Lightning, based in the northern city of Tikrit died “in a non-combated related incident, which is currently under investigation”.