At least two of four US Marines shown in a video appearing to urinate on Taliban corpses have been identified, a Marine Corps official has told the BBC. The video, which was posted online, purports to show four US Marines standing over the bodies of several Taliban fighters, at least one of whom is covered in blood. The Marines have begun a criminal investigation and an internal inquiry. US officials and Afghan officials have condemned the video as "deplorable". The origin of the video is not known, but it was originally posted to YouTube. The BBC's Steve Kingstone says the official would not confirm the Marines' whereabouts, but news reports suggested the unit involved was based at Camp Lejeune, North Carolina - a major military base. A US Marines spokesman, Lt Col Joseph Plenzler, told the AFP news agency that "we cannot release the name of the unit at this time since the incident is being investigated."