Originally published by the Voice of America (www.voanews.com). Voice of America is funded by the US Federal Government and content it exclusively produces is in the public domain. Bomb Blast Kills Four in Iraqi Capital -------------------------------------- http://enews.voanews.com/t?ctl=1261A35:3919ACA Authorities say attack occurred Saturday near busy bus station in capital's southern Dora neighborhood Iraqi Army soldier observes police vehicle in which a policeman was killed and an officer wounded when roadside bomb exploded near their convoy in western district of Mansour in Baghdad, May 27, 2006Police in Iraq say four people have been killed and at least seven others wounded in a car bomb attack in Baghdad. Authorities say the attack occurred Saturday near a busy bus station in the capital's southern Dora neighborhood. The attack came as Iraq's political leaders struggled to reach agreement on candidates for two key security posts that remain vacant a week after Prime Minister Nouri al-Maliki's government of national unity took office. Mr. Maliki had promised earlier this week that the appointments would be made by Saturday. But parliament officials said no agreement had yet been reached. Meanwhile, the U.S. military in Iraq says a U.S. Marine was killed Friday during an operation in al-Anbar province. Separately, two American news reports say U.S. Marines stationed in Iraq may have deliberately killed at least 15 Iraqi civilians last November. The reports by The New York Times and The Associated Press Friday concern an incident in the town of Haditha. U.S. Marines initially said the civilian deaths were caused by a roadside bomb and an ensuing firefight with insurgents. But residents of the town said there was no gunbattle, and the U.S. forces opened fire without provocation. U.S. officials quoted in the news reports say a military investigation is continuing, but that the evidence suggests the killings in the town of Haditha were not justified. .