The pictures showed people who were emaciated, with their bones protruding, and some bearing the marks of strangulation and repeated beatings, and eyes having been gouged out.
French Ambassador Gerard Araud said the pall of silence lingered, and then questions slowly began about the credibility of the slides of the dead, who offer mute testimony to the savagery of a Syrian civil war in which more than 150,000 have died.
The council members were shown more than the 10 photos publicly released in January as part of a forensic investigation funded by the government of Qatar a major backer of the opposition and one of the nations most deeply involved in the Syrian conflict.
The veracity of the photos could not be independently confirmed.
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Syria's Justice Ministry has dismissed the photos and accompanying report as "politicized and lacking objectiveness and professionalism," a "gathering of images of unidentified people, some of whom have turned out to be foreigners."
The ministry said some of the people were militants killed in battle and others were killed by militant groups. Among the new photos was an image of at least a dozen bodies laid out on the floor of a warehouse, being wrapping in plastic sheets with men in military garb standing among them.
"Bodies in, bodies out. It was a very systematic processing of human beings. They were laid out in a parking lot because there were too many to put into the morgue," Crane said.
"They died in agony over months of starvation and torture, and then almost mercifully were executed," Crane said. "Doesn't this bring back some interesting images from Dachau, and Auschwitz, and Bergen-Belsen?" Crane observed, sitting in front of the grisly procession of photos projected behind him in a UN news conference.