Two Iraqi civilians have been killed and five others injured in sporadic US Army fire on the main highway passing through west Baghdad\'\'s Yousifiya township, following an explosive charge blast on Saturday, a security source reported . \"An explosive charge blew off on the main highway passing through Yousifiya township, aimed at a US Army patrol that did not harm any of the patrol\'\'s soldiers,\" the source told (Aswat al-Iraq) news agency, adding that the US troops opened sporadic fire on the passing cars, killing two persons and wounding five others.