One of two photojournalists killed in a 2007 attack by a U.S. helicopter gunship in Iraq was being rescued when the gunship's crew fired on the van to which he was being carried, according to footage posted online Monday.

Reuters photographer Saeed Cmagh survived an initial strafing by the Apache gunship's 30 mm machine gun, but apparently died when the gunship opened fire on people attempting to get him off the sidewalk where he lay, according to the video. The aerial footage was posted by the Web site WikiLeaks, which said the video remains classified and "clearly shows the unprovoked slaying of a wounded Reuters employee and his rescuers."

WikiLeaks is a site that publishes anonymously submitted documents, video and other sensitive materials.

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- CNN Pentagon Correspondent Barbara Starr contributed to this report.