KOBANI, Syria — One fighter posed for selfies with the woman’s corpse. Another called her a “female pig.” Another man stood on her naked breast as someone said, “She’s beautiful, man.”

Those are some of the low points of two new videos of what appear to be Turkish-backed fighters abusing the mutilated body of a Kurdish fighter.

The videos, which were posted on Saturday by the Syrian Observatory for Human Rights, have caused an unusual uproar in a war in which hard-to-watch footage has been a regular feature.

The head of the rights group, Rami Abdul Rahman, said on Monday that he had obtained the videos from one of the fighters pictured in them, who identified the group as part of the Free Syrian Army. The Free Syrian Army is a rebel militia fighting alongside Turkey in its battle against the Kurds in northern Syria.