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Blackwater guards fired dozens of shots into cars and people, an FBI expert testified, in an example of the brutality of the 2007 killings that left 14 Iraqis dead in Baghdad. Paul Slough, Evan Liberty, Dustin Heard and Nicholas Slatten appeared dressed in suits and ties before a federal court in Washington as the second trial in the case entered its fifth week. FBI expert Douglas Murphy said he traveled to the site of the killings twice to examine the cars involved in the shootings. Asked about the weapons and ammunition used by the four defendants that day, Marine expert Shelby Lasater stressed the grenades used are "designed to penetrate armor and to cause casualties or kill."