The top commanders of the Marine Corps U.S. forces in Afghanistan are investigating a video that purports to show U.S. Marines urinating on the bodies of dead Taliban after Defense Secretary Leon Panetta ordered a probe into behavior he described is “utterly deplorable.”

“I condemn it in the strongest possible terms,” Panetta said Thursday of the actions depicted in a video released a day earlier. “This conduct is entirely inappropriate for members of the United States military and does not reflect the standards or values our armed forces are sworn to uphold. Those found to have engaged in such conduct will be held accountable to the fullest extent.”

Spokesman Jay Carney said that as a legal matter, the White House won’t pass judgment until the details are discovered, but that the “apparent” activity is deplorable and regrettable.

In the video, four men in Marine uniforms and combat gear are shown exposing their genitals and urinating on three dead bodies. One of the deceased has large blood stain on his chest.

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